Defending Colorado

Attorney General Phil Weiser and the Colorado Department of Law are working to defend Colorado communities against harmful and illegal actions from the federal government. Please sign up below to receive updates about related actions and events.

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Attorney General Announcements

Lawsuits

Date filed
51. Attorney General Phil Weiser sues HHS for conditioning funding on discriminatory policy

 Jan. 13, 2026
50. Attorney General Phil Weiser sues Trump administration to protect billions of dollars for childcare and support services for vulnerable families

 Jan. 9, 2026
49. Attorney General Phil Weiser suit challenges federal attack on gender-affirming care

 Dec. 24, 2025
48. Attorney General Phil Weiser sues Trump administration to defend important consumer protection efforts

 Dec. 22, 2025
47. Attorney General Phil Weiser sues Trump administration for illegal attempt to suspend funding for EV charging infrastructure

 Dec. 16, 2025
46. Attorney General Phil Weiser sues Trump administration over unlawful new $100k fee for H-1B visas

 Dec. 12, 2025
45. Attorney General Phil Weiser sues to block unlawful SNAP eligibility guidance Nov. 26, 2025
44. Attorney General Phil Weiser sues HUD over federal policy that would push more people into homelessness Nov. 25, 2025
43. Attorney General Phil Weiser again challenges illegal terms to emergency management and disaster relief funds

 Nov. 4, 2025
42. Attorney General Phil Weiser co-leads suit against Education Department to block public service student loan relief restrictions Nov. 3, 2025
41. Attorney General Phil Weiser sues Trump administration for unconstitutional and unlawful decision to move U.S. Space Command HQ from Colorado Springs

 Oct. 29, 2025
40. Attorney General Phil Weiser sues Trump’s USDA for illegally suspending SNAP benefits

 Oct. 28, 2025
39. Attorney General Phil Weiser sues Trump’s EPA to recover Solar for All funds Oct. 16, 2025
38. Attorney General Phil Weiser sues Trump’s EPA over unlawful cancellation of Solar for All program (PDF) Oct. 16, 2025
37. Attorney General Phil Weiser sues DOJ to protect services for survivors of domestic violence and other violent crimes

 Oct. 1, 2025
36. Colorado joins states suing over illegal conditions to programs that support comprehensive sexual health education

 Sept. 26, 2025
35. Attorney General Phil Weiser fights Trump administration for $1B in federal funds to support crime victims

 Aug. 18, 2025
34. Attorney General Phil Weiser sues to stop federal cuts that threaten state-run energy programs

 Aug. 15, 2025
33. Attorney General Phil Weiser sues Trump administration for blocking Planned Parenthood from receiving Medicaid funding July 29, 2025
32. Attorney General Phil Weiser sues to stop Trump administration’s illegal demands that states hand over sensitive personal data of SNAP recipients

 July 28, 2025
31. Attorney General Phil Weiser files lawsuit to block federal restrictions on public benefits July 21, 2025
30. Colorado sues to stop Trump health insurance exchange rule that will raise costs, leave 1.8 million uninsured July 17, 2025
29. Attorney General Phil Weiser sues Trump administration to save $4B program that fortifies communities against natural disasters

 July 16, 2025
28. Attorney General Phil Weiser helps lead lawsuit against Trump administration for freezing $6.8 billion in education funding just weeks before school year start

 July 14, 2025
27. Colorado sues U.S. Department of Education over illegal termination of youth mental health funding

 July 1, 2025
26. Coalition of states sue to block mass transfer of Medicaid enrollee data to ICE

 July 1, 2025
25. Coalition of states sue federal agencies over illegal use of regulation to slash billions in funding June 24, 2025
24. Colorado State University joins lawsuit challenging Department of Defense slashing indirect cost rates for government-funded research (PDF) June 16, 2025
23. Attorney General Phil Weiser joins lawsuit challenging Trump administration’s attack on Colorado’s Clean Car Program June 12, 2025
22. Attorney General Phil Weiser sues ATF to stop return of seized machine gun devices June 9, 2025
21. Attorney General Phil Weiser sues Trump administration over illegal cuts to National Science Foundation funding May 28, 2025
20. Colorado joins lawsuit against Trump administration over illegal immigration conditions placed on infrastructure funding

 May 13, 2025
19. Colorado joins lawsuit against Trump administration over illegal immigration conditions placed on emergency services funding (PDF)

 May 13, 2025
18. Attorney General Phil Weiser sues to stop illegal termination of federal electric vehicle infrastructure funding

 May 7, 2025
17. Attorney General Phil Weiser sues Trump administration for halting wind energy development May 5, 2025
16. Attorney General Phil Weiser sues to stop dismantling of U.S. Department of Health and Human Services May 5, 2025
15. Gutting of AmeriCorps is the latest AG lawsuit challenging the Trump administration

 April 29, 2025
14. Attorney General Phil Weiser sues Trump administration over unlawful conditions for K-12 funding April 27, 2025
13. Colorado joins lawsuit to stop Trump administration’s illegal tariffs that are raising prices and creating economic chaos

 April 23, 2025
12. Attorney General Phil Weiser joins lawsuit to stop dismantling of federal agencies that support libraries, museums, minority-owned businesses and workers

 April 4, 2025
11. NIH lawsuit – Challenging unlawful grant terminations and delays (PDF) April 4, 2025
10. Attorney General Phil Weiser joins lawsuit against Trump administration’s unlawful executive order seeking to impose sweeping voting restrictions April 3, 2025
9. Attorney General Phil Weiser sues HHS, Secretary Kennedy to overturn illegal public health grant cuts

 April 1, 2025
8. Attorney General Phil Weiser sues to stop dismantling of U.S. Department of Education and protect students

 March 13, 2025
7. Attorney General Phil Weiser joins lawsuit against mass firings (PDF) March 6, 2025
6. Attorney General Weiser joins lawsuit against feds to save K-12 teacher preparation grants for Colorado rural schools March 6, 2025
5. Colorado joins lawsuit challenging White House order criminalizing and ending funding for gender-affirming care Feb. 19, 2025
4. Attorney General Phil Weiser sues Trump administration for defunding medical and public health research

 Feb. 10, 2025
3. Attorney General Phil Weiser joins multistate coalition in suing to stop Elon Musk and DOGE’s attacks on Americans info and data Feb. 7, 2025
2. Attorney General Phil Weiser sues to reverse White House freeze on federal funds

 Jan. 28, 2025
1. Attorney General Phil Weiser challenges unconstitutional executive order ending birthright citizenship

 Jan. 21, 2025




Attorney General Advisories & Remarks

Related events (archive or future listings)

Watch the Replay: Community Impact Hearing Townhall

Protecting Your Rights Against Illegal Federal Action | April 16, 2025 – Denver, CO

Weiser was joined by fellow state attorneys general—Anne Lopez (HI), Aaron Ford (NV), and Nick Brown (WA)—for a powerful discussion on how state leaders are pushing back against illegal federal overreach. They shared how they’re working to uphold civil rights, protect communities, and ensure every voice is heard. Catch up now and hear firsthand how state leadership is protecting your rights and shaping the future.