A Brief History of the United States Capitol Building

Quick Answer

The United States Capitol Building has faced unprecedented security challenges in recent years, with threats against Congress members rising for three consecutive years through 2025, reaching 14,938 investigated cases. Security protocols have been repeatedly strengthened, including a 24/7 intelligence center, updated prohibited items lists effective July 2025, and special designations for high-risk events like the January 6 certification.

As of July 2026, visitor tours are suspended due to a federal funding lapse, reflecting ongoing tensions surrounding the building's role as both a working government facility and a public symbol.

Key Facts

• Threats against Congress rose for the third consecutive year in 2025, with the U.S. Capitol Police investigating 14,938 cases, up from 9,474 in 2024
• The spike was attributed to "a false sense of anonymity online" and political rhetoric, according to Capitol Police
• A 24/7 Protective Intelligence Operations Center (PIOC) launched in 2024 to receive and process safety reports regarding members of Congress
• The prohibited items list was updated effective July 14, 2025, categorizing banned items into three groups
• As of October 1, 2025, the Capitol Visitor Center closed due to a lapse in federal funding, with tours suspended as of July 2026
• The Department of Homeland Security provided a special security designation for the January 6, 2025 presidential vote certification
• A wrongful death settlement of $5 million was paid to the family of Ashli Babbitt, who was fatally shot by police while breaching the Capitol
• Convictions of four Proud Boys in the January 6 insurrection were vacated, and approximately 1,500 January 6 defendants received pardons

The Rising Threat Landscape Three Years of Escalation

The U.S. Capitol Police's annual threat assessment report for 2025 revealed a stark reality: threats against members of Congress have climbed for three consecutive years, reaching their highest level in recent memory.

The 14,938 investigated cases represent a 57.7% increase from the 9,474 cases recorded in 2024. This sustained upward trajectory has fundamentally altered how the Capitol operates as both a legislative workspace and a public institution.

What's Driving the Increase

Capitol Police officials have pointed to two primary factors behind the surge. First, the anonymity afforded by online platforms has created an environment where individuals feel emboldened to make threats they would never utter in person.

Second, the broader political climate, characterized by increasingly heated rhetoric, has lowered the threshold for what people consider acceptable in political discourse. As Capitol Police stated, "Decreasing violent political rhetoric is one of the best ways to decrease the number of threats across the country."

This is not a new phenomenon but rather an acceleration of trends observed since the 2020 election cycle.

The January 6, 2021 attack on the Capitol served as a watershed moment, demonstrating how online threats can translate into real-world violence. Since then, the security apparatus around Congress has had to adapt continuously, with each year bringing new challenges that require new responses.

The Human Toll on Law Enforcement

Behind the statistics are real people tasked with protecting 535 members of Congress and their staffs, as well as the thousands of visitors who pass through the Capitol complex daily. The Threat Assessment Section (TAS) of the Capitol Police has had to grow and reorganize to handle the increased caseload.

Each of those 14,938 cases required investigation, triage, and in some cases, intervention by law enforcement or mental health professionals. The psychological burden on officers cannot be overstated.

They must distinguish between credible threats and protected speech, between individuals who need help and those who intend harm. This is not a simple binary; many cases fall into gray areas where careful judgment is required.

The expansion of the Protective Intelligence Operations Center into a 24/7 operation in 2024 was a direct response to this increased workload, ensuring that reports about member safety can be processed at any hour.

Security Infrastructure How the Capitol Has Adapted

The 24/7 Intelligence Center

One of the most significant security upgrades in recent years has been the full activation of the Protective Intelligence Operations Center. Launched in 2024, the PIOC operates around the clock to receive and process reports regarding the safety of members of Congress.

This represents a fundamental shift from a reactive security posture to a proactive one. Before the PIOC, threat assessments were handled during normal business hours, with after-hours reports often waiting until the next day for review.

In an environment where threats can escalate rapidly, particularly during overnight hours when social media activity peaks, this gap was a vulnerability. The PIOC closes that gap, allowing for real-time assessment of threats regardless of when they are reported.

The center serves as a central clearinghouse for intelligence from multiple sources: direct reports from members and staff, tips from the public, monitoring of social media and other public forums, and coordination with federal, state, and local law enforcement partners. This integrated approach allows for faster identification of patterns and connections between seemingly unrelated incidents.

Updated Prohibited Items July 2025

Effective July 14, 2025, the Capitol Police Board approved an updated list of prohibited items, organized into three categories. This was not a minor tweak but a comprehensive overhaul reflecting lessons learned from security incidents over the preceding years.

Category 1: Weapons and Dangerous Items

• Firearms and ammunition
• Tasers and stun guns
• Impact weapons (batons, blackjacks, clubs, maces, slungshot)
• Mace and pepper spray
• Knives and other bladed instruments

Category 2: Disruptive Items

• Laser pointers
• Noise amplification devices (bullhorns and sound amplifying equipment)
• Signs exceeding 18 inches wide by 14 inches high
• Structures or supports for signs and placards
• Non-aerosol spray

Category 3: Restricted Items

• Aerosols of any kind
• Food and beverages (including bottled water) except in designated areas
• Smoking materials (smoking is not permitted anywhere in the Capitol)

The inclusion of items like laser pointers and noise amplification devices reflects specific security concerns. Laser pointers have been used in attempts to distract or disorient security personnel.

Bullhorns and similar devices can be used to coordinate disruptive protests or create chaos in crowded spaces. The food and beverage restriction, while seemingly mundane, serves multiple purposes.

It prevents spills that could damage historic artifacts and furnishings, reduces the attractiveness of the Capitol as a gathering spot for extended periods, and eliminates potential hiding places for contraband. Exceptions exist for medical needs and child care, ensuring that legitimate requirements are accommodated.

Security for High-Profile Events

The January 6, 2025 certification of the presidential vote received a special security designation from the Department of Homeland Security, marking the first time such a designation had been applied to this particular event since the 2021 attack. This designation allowed for enhanced coordination between federal, state, and local law enforcement agencies, as well as additional resources for the Capitol Police.

The security planning for this event was informed directly by the lessons of January 6, 2021. Intelligence sharing was expanded, physical barriers were reinforced, and contingency plans were developed for multiple scenarios.

The presence of the National Guard was coordinated in advance, rather than as an emergency response. This proactive approach appears to have been effective.

The certification proceeded without major incident, a outcome that would have seemed uncertain just a few years earlier. However, the need for such extensive security measures for what is normally a routine procedural event underscores how fundamentally the Capitol's security posture has changed.

The Building as a Battleground Recent Incidents and Legal Developments

The Ashli Babbitt Settlement

In a case that has drawn significant attention, the U.S. government agreed to pay $5 million to settle a wrongful death lawsuit brought by the family of Ashli Babbitt.

Babbitt was fatally shot by a Capitol Police officer on January 6, 2021, while attempting to breach a barricaded area of the Capitol during the insurrection. The settlement does not admit wrongdoing but resolves the civil claim without a trial.

It reflects the ongoing legal and political complexities surrounding the events of that day. For some, Babbitt is seen as a victim of excessive force; for others, the officer's actions were justified in preventing further violence.

The settlement allows the government to avoid a potentially divisive trial while providing some financial resolution to the family.

The Proud Boys Convictions Vacated

In another significant legal development, a judge vacated the convictions of four members of the Proud Boys who had been found guilty in connection with the January 6 insurrection. This action came alongside presidential pardons for approximately 1,500 January 6 defendants.

These legal actions have reshaped the narrative around the Capitol attack. While the basic facts of what occurred remain undisputed—a violent breach of the Capitol building aimed at disrupting the certification of the 2020 election—the legal consequences for participants continue to evolve.

Some defendants who had been sentenced to lengthy prison terms have been released; others have had their convictions overturned entirely. The impact on Capitol security is indirect but real.

The perception among some potential actors that January 6 participants have faced reduced consequences could embolden future threats. Conversely, the legal system's capacity to review and correct potential overreach in prosecutions serves as a check on executive power, a principle that the Capitol itself was designed to embody.

The Christmas Tree and the Protester

The Capitol remains a stage for both celebration and protest, often simultaneously. In December 2025, the annual Christmas tree lighting ceremony took place, with a tree named "Silver Belle" selected from the Humboldt-Toiyabe National Forest in Nevada.

This tradition, dating back decades, represents one of the few remaining non-political events at the Capitol. But the same week, a protester held a photo of Ashli Babbitt near the Capitol grounds, a reminder that the building's symbolic power extends beyond its legislative function.

The Capitol is where victims of historic injustices speak, where political movements gather, and where individual grievances are aired. Lisa Phillips, a victim of Jeffrey Epstein, spoke at a dais in front of the Capitol building, using its platform to draw attention to her cause.

This duality—the Capitol as both a symbol of democratic governance and a backdrop for personal and political expression—creates inherent security challenges. How do you protect a building that must remain accessible?

How do you screen for threats without chilling legitimate protest? These are not questions with easy answers.

The Machete Incident

Perhaps the most direct example of ongoing security risks came when a man was arrested with a machete and knives at the Capitol. The individual was stopped at a security checkpoint while attempting to enter the Capitol Visitor Center.

This incident, while not resulting in violence, demonstrates that the threat is not merely theoretical. The Capitol Police's screening procedures, which require all visitors to pass through security checkpoints at least 60 minutes before their reservation time, are designed to catch exactly these types of threats.

The fact that this individual was intercepted before entering the building suggests the system is working, but the frequency with which such incidents occur—and the public's awareness of them—creates an atmosphere of constant vigilance.

The Current State Tours Suspended and an Uncertain Future

As of July 29, 2026, the U.S. Capitol Visitor Center remains closed due to a lapse in federal funding that began on October 1, 2025.

All tours are suspended, meaning that the public cannot currently access the building for educational visits. This is not a security measure per se, but a consequence of broader federal budget disputes.

The closure has practical and symbolic implications. Practically, millions of visitors who would normally tour the Capitol each year are unable to do so.

School groups, international tourists, and American citizens exercising their right to see their government in action are all turned away. The Capitol Visitor Center, which opened in 2008 as a state-of-the-art facility designed to enhance security while improving the visitor experience, sits empty.

Symbolically, a closed Capitol sends a message about the state of American governance. A building that was designed to be open to the people, that represents the idea that government belongs to the governed, is now inaccessible.

This is not the first time the Capitol has closed due to funding lapses, but each closure reinforces a narrative of dysfunction.

What Visitors Need to Know When Tours Resume

When tours do resume, visitors should plan for a significantly different experience than in previous years. The updated prohibited items list will be in full effect.

Visitors should allow at least 60 minutes for security screening. Food and beverages, including bottled water, are not permitted inside the building.

The use of quiet voices is required throughout the Capitol and Visitor Center. The building remains a working office building, not merely a museum.

Members of Congress and their staffs continue to conduct business, even as public access is restricted. This means that visitors who do gain entry must be respectful of the fact that the people they see in the hallways are not actors or reenactors but actual lawmakers and employees doing their jobs.

The Long-Term Security Outlook

The trends are clear: threats are rising, security is tightening, and the Capitol is becoming a harder place to access. Whether this represents a temporary response to specific events or a permanent shift in how the building operates remains to be seen.

Several factors will influence the trajectory. The political climate, particularly the tenor of online discourse, will play a major role.

If rhetoric cools, threats may decrease. If it continues to heat up, the Capitol Police will need additional resources and authorities.

Technology will also shape security. The PIOC's 24/7 operations represent an investment in intelligence-led security, but the same technologies that enable threat detection also raise privacy concerns.

Balancing security with civil liberties is a challenge that will only grow more complex. Finally, the physical infrastructure of the Capitol itself may need to evolve.

The building was designed in the 18th and 19th centuries, when the concept of a mass shooter or a coordinated attack was unimaginable. Retrofitting it for modern threats while preserving its historic character is an ongoing challenge.

Frequently Asked Questions

Why have threats against Congress members increased so dramatically?

The U.S. Capitol Police have attributed the rise to two main factors: online anonymity that emboldens individuals to make threats they would not make in person, and increasingly heated political rhetoric that normalizes aggressive language toward political opponents.

The number of investigated cases rose from 9,474 in 2024 to 14,938 in 2025, representing a three-year trend of escalation.

What items are currently prohibited at the Capitol?

The updated list, effective July 14, 2025, prohibits weapons including firearms, tasers, impact weapons, mace, and pepper spray. Also banned are laser pointers, noise amplification devices, signs larger than 18 by 14 inches, aerosol products, and food and beverages (except in designated areas).

Smoking is prohibited throughout the Capitol. Exceptions exist for medical needs and child care.

Is the Capitol currently open for tours?

As of July 29, 2026, the Capitol Visitor Center is closed and all tours are suspended due to a lapse in federal funding that began on October 1, 2025. When tours resume, visitors should plan to arrive at least 60 minutes before their reservation to allow for security screening.

What happened with the January 6 legal cases?

Convictions of four Proud Boys in connection with the January 6 insurrection were vacated by a judge. Additionally, approximately 1,500 January 6 defendants received presidential pardons.

The government also agreed to pay $5 million to settle a wrongful death lawsuit brought by the family of Ashli Babbitt, who was fatally shot by police while breaching the Capitol.

How has Capitol security changed since January 6, 2021?

Security enhancements include the creation of a 24/7 Protective Intelligence Operations Center (PIOC) that processes member safety reports around the clock, updated prohibited items lists, special security designations for high-risk events like the electoral vote certification, and expanded coordination with federal, state, and local law enforcement. The Capitol Police have also increased their threat assessment capabilities to handle the rising caseload.

Reference Notes

Information in this article is based on publicly available sources. Some details may change over time.

Verify with official sources before acting.