Lawsuits
|
Date filed
|
Category
|
Status
|
| 63. Attorney General Phil Weiser sues Agriculture Secretary Rollins for holding hostage billions in critical USDA funding
|
March 23, 2026 |
Funding |
Pending |
| 62. Attorney General Phil Weiser challenges unlawful rollback of landmark policy to fight greenhouse gas pollution
|
March 19, 2026 |
Environment |
Pending |
| 61. Attorney General Phil Weiser files lawsuit to overturn federal order to keep Craig coal power plant open
|
March 18, 2026 |
Environment |
Pending |
| 60. Attorney General Phil Weiser joins coalition challenging Trump administration’s attack on state fair housing laws
|
March 16, 2026 |
Funding |
Status (opens new tab) |
| 59. Attorney General Phil Weiser sues to stop Education Department’s unlawful data demand to colleges and universities
|
March 11, 2026 |
Data Privacy |
Status (opens new tab) |
| 58. Attorney General Phil Weiser sues Trump administration to stop latest round of illegal tariffs and price increases
|
March 5, 2026 |
Tariffs |
Status (opens new tab) |
| 57. Attorney General Phil Weiser sues EPA to defend Colorado’s plan to fight air pollution and regional haze
|
March 4, 2026 |
Environment |
Status (opens new tab) |
| 56. Attorney General Phil Weiser sues DHS, FEMA to recover grants to combat terrorism
|
Feb. 25, 2026 |
Funding |
Status (opens new tab) |
| 55. Attorney General Phil Weiser joins lawsuit challenging HHS Secretary Kennedy’s illegal overhaul of federal childhood immunization policy
|
Feb. 24, 2026 |
Healthcare |
Status (opens new tab) |
| 54. Attorney General Phil Weiser sues Energy Secretary Chris Wright for illegally ending $600M in leading-edge energy projects in Colorado
|
Feb. 18, 2026 |
Funding |
Status (opens new tab) |
| 53. Attorney General Phil Weiser sues Trump administration over unlawful directive to cut more than $600M in federal public health grants
|
Feb. 11, 2026 |
Funding |
Status (opens new tab) |
| 52. Attorney General Phil Weiser sues President Trump, Interior Secretary Burgum over made-up “energy emergency”
|
Jan. 30, 2026 |
Environment |
Status (opens new tab) |
| 51. Attorney General Phil Weiser sues HHS for conditioning funding on discriminatory policy
|
Jan. 13, 2026 |
Funding |
Status (opens new tab) |
| 50. Attorney General Phil Weiser sues Trump administration to protect billions of dollars for childcare and support services for vulnerable families
|
Jan. 9, 2026 |
Funding |
Status (opens new tab) |
| 49. Attorney General Phil Weiser suit challenges federal attack on gender-affirming care
|
Dec. 24, 2025 |
Healthcare |
Status (opens new tab) |
| 48. Attorney General Phil Weiser sues Trump administration to defend important consumer protection efforts
|
Dec. 22, 2025 |
Consumer Protection |
Status (opens new tab) |
| 47. Attorney General Phil Weiser sues Trump administration for illegal attempt to suspend funding for EV charging infrastructure
|
Dec. 16, 2025 |
Funding |
Status (opens new tab) |
| 46. Attorney General Phil Weiser sues Trump administration over unlawful new $100k fee for H-1B visas
|
Dec. 12, 2025 |
Immigration |
Status (opens new tab) |
| 45. Attorney General Phil Weiser sues to block unlawful SNAP eligibility guidance |
Nov. 26, 2025 |
Immigration |
Status (opens new tab) |
| 44. Attorney General Phil Weiser sues HUD over federal policy that would push more people into homelessness
|
Nov. 25, 2025 |
Funding |
Status (opens new tab) |
| 43. Attorney General Phil Weiser again challenges illegal terms to emergency management and disaster relief funds
|
Nov. 4, 2025 |
Funding |
Status (opens new tab) |
| 42. Attorney General Phil Weiser co-leads suit against Education Department to block public service student loan relief restrictions |
Nov. 3, 2025 |
Education |
Status (opens new tab) |
| 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 |
Government Agencies |
Status (opens new tab) |
| 40. Attorney General Phil Weiser sues Trump’s USDA for illegally suspending SNAP benefits
|
Oct. 28, 2025 |
Funding |
Status (opens new tab) |
| 39. Attorney General Phil Weiser sues Trump’s EPA to recover Solar for All funds |
Oct. 16, 2025 |
Funding |
Status (opens new tab) |
| 38. Attorney General Phil Weiser sues Trump’s EPA over unlawful cancellation of Solar for All program (PDF) |
Oct. 16, 2025 |
Environment |
Status (opens new tab) |
| 37. Attorney General Phil Weiser sues DOJ to protect services for survivors of domestic violence and other violent crimes
|
Oct. 1, 2025 |
Funding |
WON |
| 36. Colorado joins states suing over illegal conditions to programs that support comprehensive sexual health education
|
Sept. 26, 2025 |
Healthcare |
Status (opens new tab) |
| 35. Attorney General Phil Weiser fights Trump administration for $1B in federal funds to support crime victims
|
Aug. 18, 2025 |
Funding |
WON |
| 34. Attorney General Phil Weiser sues to stop federal cuts that threaten state-run energy programs
|
Aug. 15, 2025 |
Funding |
WON |
| 33. Attorney General Phil Weiser sues Trump administration for blocking Planned Parenthood from receiving Medicaid funding |
July 29, 2025 |
Healthcare |
Status (opens new tab) |
| 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 |
Data Privacy |
Status (opens new tab) |
| 31. Attorney General Phil Weiser files lawsuit to block federal restrictions on public benefits |
July 21, 2025 |
Immigration |
Status (opens new tab) |
| 30. Colorado sues to stop Trump health insurance exchange rule that will raise costs, leave 1.8 million uninsured |
July 17, 2025 |
Healthcare |
Status (opens new tab) |
| 29. Attorney General Phil Weiser sues Trump administration to save $4B program that fortifies communities against natural disasters
|
July 16, 2025 |
Funding |
WON |
| 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 |
Funding |
WON |
| 27. Colorado sues U.S. Department of Education over illegal termination of youth mental health funding
|
July 1, 2025 |
Funding |
WON |
| 26. Coalition of states sue to block mass transfer of Medicaid enrollee data to ICE
|
July 1, 2025 |
Data Privacy |
Status (opens new tab) |
| 25. Coalition of states sue federal agencies over illegal use of regulation to slash billions in funding |
June 24, 2025 |
Funding |
Status (opens new tab) |
| 24. Colorado State University joins lawsuit challenging Department of Defense slashing indirect cost rates for government-funded research (PDF) |
June 16, 2025 |
Funding |
Status (opens new tab) |
| 23. Attorney General Phil Weiser joins lawsuit challenging Trump administration’s attack on Colorado’s Clean Car Program |
June 12, 2025 |
Environment |
Status (opens new tab) |
| 22. Attorney General Phil Weiser sues ATF to stop return of seized machine gun devices
|
June 9, 2025 |
Gun Safety |
Status (opens new tab) |
| 21. Attorney General Phil Weiser sues Trump administration over illegal cuts to National Science Foundation funding |
May 28, 2025 |
Funding |
Status (opens new tab) |
| 20. Colorado joins lawsuit against Trump administration over illegal immigration conditions placed on infrastructure funding
|
May 13, 2025 |
Funding |
WON |
| 19. Colorado joins lawsuit against Trump administration over illegal immigration conditions placed on emergency services funding (PDF)
|
May 13, 2025 |
Funding |
WON |
| 18. Attorney General Phil Weiser sues to stop illegal termination of federal electric vehicle infrastructure funding
|
May 7, 2025 |
Environment |
Status (opens new tab) |
| 17. Attorney General Phil Weiser sues Trump administration for halting wind energy development |
May 5, 2025 |
Environment |
WON |
| 16. Attorney General Phil Weiser sues to stop dismantling of U.S. Department of Health and Human Services |
May 5, 2025 |
Firings |
Status (opens new tab) |
| 15. Gutting of AmeriCorps is the latest AG lawsuit challenging the Trump administration
|
April 29, 2025 |
Funding |
Status (opens new tab) |
| 14. Attorney General Phil Weiser sues Trump administration over unlawful conditions for K-12 funding |
April 27, 2025 |
Funding |
Status (opens new tab) |
| 13. Colorado joins lawsuit to stop Trump administration’s illegal tariffs that are raising prices and creating economic chaos
|
April 23, 2025 |
Tariffs |
WON |
| 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 |
Funding |
WON |
| 11. NIH lawsuit – Challenging unlawful grant terminations and delays (PDF) |
April 4, 2025 |
Funding |
Status (opens new tab) |
| 10. Attorney General Phil Weiser joins lawsuit against Trump administration’s unlawful executive order seeking to impose sweeping voting restrictions |
April 3, 2025 |
Elections |
Status (opens new tab) |
| 9. Attorney General Phil Weiser sues HHS, Secretary Kennedy to overturn illegal public health grant cuts
|
April 1, 2025 |
Funding |
Status (opens new tab) |
| 8. Attorney General Phil Weiser sues to stop dismantling of U.S. Department of Education and protect students
|
March 13, 2025 |
Education |
Status (opens new tab) |
| 7. Attorney General Phil Weiser joins lawsuit against mass firings (PDF) |
March 6, 2025 |
Firings |
Status (opens new tab) |
| 6. Attorney General Weiser joins lawsuit against feds to save K-12 teacher preparation grants for Colorado rural schools |
March 6, 2025 |
Funding |
Status (opens new tab) |
| 5. Colorado joins lawsuit challenging White House order criminalizing and ending funding for gender-affirming care |
Feb. 19, 2025 |
Funding |
Status (opens new tab) |
| 4. Attorney General Phil Weiser sues Trump administration for defunding medical and public health research
|
Feb. 10, 2025 |
Funding |
Status (opens new tab) |
| 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 |
Data Privacy |
Status (opens new tab) |
| 2. Attorney General Phil Weiser sues to reverse White House freeze on federal funds
|
Jan. 28, 2025 |
Funding |
Status (opens new tab) |
| 1. Attorney General Phil Weiser challenges unconstitutional executive order ending birthright citizenship
|
Jan. 21, 2025 |
Citizenship |
Status (opens new tab) |
