H.R. 4257 (119th)Bill Overview

End Domestic Terrorism Act

Crime and Law Enforcement|Crime and Law Enforcement
Cosponsors
Support
Democratic
Introduced
Jun 30, 2025
Discussions
Bill Text
Current stageCommittee

Referred to the House Committee on the Judiciary.

Introduced
Committee
Floor
President
Law
Congressional Activities
01 · The brief
Plain-English summaryWhat this bill actually does

This bill creates a new federal criminal offense (18 U.S.C. 2332j) that carries penalties of any term of years or life imprisonment for anyone who kills three or more people in a single incident using a machinegun, a destructive device, or a broadly defined “covered semiautomatic weapon,” when certain interstate commerce or federal jurisdictional hooks apply or at specified public locations. The bill defines “covered semiautomatic weapon” by enumerating features often associated with assault-style rifles and shotguns, includes parts that accelerate rate of fire, and authorizes the Attorney General to designate similar weapons by rule.

Why people may split

Scope and federal authority: conservatives see federal overreach, while liberals view federal tools as necessary for particularly lethal incidents.

Watch point

Relative to its intended legislative type, this bill primarily effects substantive criminal-law change by creating a new federal offense and associated penalties, and it pairs that change with reporting and limited administrative rulemaking authority.

This bill creates a new federal criminal offense (18 U.S.C. 2332j) that carries penalties of any term of years or life imprisonment for anyone who kills three or more people in a single incident using a machinegun, a destructive device, or a broadly defined “covered semiautomatic weapon,” when certain interstate commerce or federal jurisdictional hooks apply or at specified public locations.

The bill defines “covered semiautomatic weapon” by enumerating features often associated with assault-style rifles and shotguns, includes parts that accelerate rate of fire, and authorizes the Attorney General to designate similar weapons by rule.

It amends the material-support statute to reference the new offense, requires the Attorney General to produce annual DOJ reports on cases charged under the new offense and material-support charges (including demographic data for defendants), and requires public reporting after DOJ files charges on incident attendance, government response costs, lost business revenue, and assistance provided.

Passage20/100

Judged solely by content and typical legislative patterns, the bill addresses a highly contentious policy area with a broad, feature‑based definition of regulated weapons and substantial criminal penalties. It lacks strong built‑in compromise mechanisms (no sunset or narrow pilot), which lowers the chance of attracting the necessary supermajority support in the Senate and makes House passage contested. Administrative reporting and rulemaking add complexity but do not by themselves ease political opposition. Taken together, these features make enactment unlikely without significant revision or negotiated concessions.

CredibilityPartially aligned

Relative to its intended legislative type, this bill primarily effects substantive criminal-law change by creating a new federal offense and associated penalties, and it pairs that change with reporting and limited administrative rulemaking authority.

Contention70/100

Scope and federal authority: conservatives see federal overreach, while liberals view federal tools as necessary for particularly lethal incidents.

02 · What it does

Who stands to gain, and who may push back.

Likely benefits vs burdens50% / 50%
Federal agenciesManufacturers · Federal agencies

These are examples from the analysis, not a ranked list of the most-affected groups.

Likely helped
  • Federal agenciesCreates a specific federal offense and increases maximum penalties (including life imprisonment) for mass killings with…
  • Federal agenciesStandardizes definitions of covered semiautomatic weapons and authorizes Attorney General rulemaking to identify substa…
  • Potential benefitRequires DOJ to produce detailed annual and near-term public reports (including incident costs, victim assistance, and…
Likely burdened
  • ManufacturersThe bill's broadly worded definition of "covered semiautomatic weapon," inclusion of many common features, and AG autho…
  • Federal agenciesExpanding federal criminal jurisdiction for mass killings may raise federalism concerns and overlap with state homicide…
  • Federal agenciesImplementation is likely to increase federal prosecutorial workload and could add to incarceration costs if convictions…
03 · Why people split

Why the argument around this bill splits.

Scope and federal authority: conservatives see federal overreach, while liberals view federal tools as necessary for particularly lethal incidents.
Progressive80%

A mainstream liberal/left-leaning person would likely view the bill mostly positively as a targeted federal tool to address mass killings with high-capacity or assault-style weapons and to collect data that could inform prevention and victim support.

They would welcome federal jurisdiction where weapons cross state lines and the reporting requirements that quantify public costs and demographic patterns.

At the same time, they may be cautious about expanding criminal penalties without parallel investments in prevention (mental health, community violence intervention) and be attentive to racial disparities in enforcement given mandatory demographic reporting.

Leans supportive
Centrist55%

A pragmatic centrist would likely see the bill as a reasonable federal response to particularly lethal mass-shooting incidents, appreciating the attempt to target weapons associated with high-casualty events and to collect data on costs and defendants.

They would also have concerns about federalism, the clarity of the statutory definitions, and the scope of the Attorney General’s rulemaking authority.

Centrists would want assurances that the law is narrowly tailored, that it won't criminalize lawful owners unintentionally, and that reporting requirements protect privacy while delivering useful data.

Split reaction
Conservative15%

A mainstream conservative would likely oppose or be skeptical of the bill as an expansion of federal criminal law and a potential infringement on lawful gun ownership.

They would view the statutory definition of covered semiautomatic weapons as broad and categorical (explicitly naming AR/AK types), see AG rulemaking authority as a path to administrative overreach, and question the need for a new federal offense when murder and existing federal statutes already cover mass killings.

They would also be concerned about federal costs, commerce-clause jurisdictional reach, and the collection/publication of defendants’ race and ethnicity.

Likely resistant
04 · Can it pass?

The path through Congress.

Introduced

Reached or meaningfully advanced

Committee

Reached or meaningfully advanced

Floor

Still ahead

President

Still ahead

Law

Still ahead

Passage likelihood20/100

Judged solely by content and typical legislative patterns, the bill addresses a highly contentious policy area with a broad, feature‑based definition of regulated weapons and substantial criminal penalties. It lacks strong built‑in compromise mechanisms (no sunset or narrow pilot), which lowers the chance of attracting the necessary supermajority support in the Senate and makes House passage contested. Administrative reporting and rulemaking add complexity but do not by themselves ease political opposition. Taken together, these features make enactment unlikely without significant revision or negotiated concessions.

Scope and complexity
52%
Scopemoderate
52%
Complexitymedium
Why this could stall
  • How Congressional committee review, amendment, and floor bargaining might alter definitional language (e.g., narrowing the scope of “covered semiautomatic weapon”) before votes.
  • Whether sponsors secure offsets, appropriations, or other legislative sweeteners that could change member support; the bill contains no funding provisions for the new reporting or anticipated prosecutorial workload.
05 · Recent votes

Recent votes on the bill.

No vote history yet

The bill has not accumulated any surfaced votes yet.

06 · Go deeper

Go deeper than the headline read.

Included on this page

Scope and federal authority: conservatives see federal overreach, while liberals view federal tools as necessary for particularly lethal in…

Judged solely by content and typical legislative patterns, the bill addresses a highly contentious policy area with a broad, feature‑based…

Unlocked analysis

Relative to its intended legislative type, this bill primarily effects substantive criminal-law change by creating a new federal offense and associated penalties, and it pairs that change with reporting and limited admi…

Go beyond the headline summary with full stakeholder mapping, legislative design analysis, passage barriers, and lens-by-lens tradeoff breakdowns.

Perspective breakdownsPassage barriersLegislative design reviewStakeholder impact map
Open full analysis