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

 Dec. 12
45. Attorney General Phil Weiser sues to block unlawful SNAP eligibility guidance Nov. 26
44. Attorney General Phil Weiser sues HUD over federal policy that would push more people into homelessness Nov. 25
43. Attorney General Phil Weiser again challenges illegal terms to emergency management and disaster relief funds Nov. 4
42. Attorney General Phil Weiser co-leads suit against Education Department to block public service student loan relief restrictions Nov. 3
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
40. Attorney General Phil Weiser sues Trump’s USDA for illegally suspending SNAP benefits

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

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

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

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

 Aug. 15
33. Attorney General Phil Weiser sues Trump administration for blocking Planned Parenthood from receiving Medicaid funding July 29
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
31. Attorney General Phil Weiser files lawsuit to block federal restrictions on public benefits July 21
30. Colorado sues to stop Trump health insurance exchange rule that will raise costs, leave 1.8 million uninsured July 17
29. Attorney General Phil Weiser sues Trump administration to save $4B program that fortifies communities against natural disasters

 July 16
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
27. Colorado sues U.S. Department of Education over illegal termination of youth mental health funding

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

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

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

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

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

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

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

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

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

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

 Feb. 10
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
2. Attorney General Phil Weiser sues to reverse White House freeze on federal funds

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

 Jan. 21




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.