Since President Donald Trump took office in January, Colorado Attorney General Phil Weiser has sued to block the president’s policies 49 times, according to his office.
And he’s mostly won.
A review of Weiser’s cases shows courts have partially or fully blocked Trump administration policies from taking effect, at least temporarily, in 30 cases, left the policies in place for now in eight cases, and are still considering 11 cases.
Weiser, a Democrat running for governor in 2026, joined other state attorneys general or governors on all of the cases. The decisions face appeals and are largely preliminary.
The 49 cases Weiser has brought so far eclipse the 11 he filed against Trump during the Republican’s first presidency.
Here is where the lawsuits stand as of Dec. 24, 2025.
● 30 Weiser cases blocking Trump policy (for now)
Immigration
Weiser sued to block Trump’s attempt to end birthright citizenship, which guarantees that people born in the U.S. are citizens, regardless of whether their parents are in the country legally.
- Read more: Colorado, 21 other states sue Trump to block order ending birthright citizenship
- Case here: State of New Jersey vs. Trump, Court of Appeals for the First Circuit
Weiser sued to block Trump’s transfer of Medicaid data to immigration agencies.
- Read more: Colorado, 19 other states sue to stop transfer of Medicaid data to immigration agencies
- Case here: State of California vs. U.S. Department of Health and Human Services, District Court, N.D. California
Weiser sued to block Trump’s policy requiring state agencies to verify individuals’ immigration status before allowing them to access federal aid.
Climate and environment
Weiser sued to block Trump’s attempt to pause federal funding for electrical vehicle charging projects.
Weiser sued to block Trump’s attempt to stop the development of wind energy.
Data privacy
Weiser sued to block Elon Musk and the Department of Government Efficiency, known as DOGE, from accessing private taxpayer data.
- Read more: All the lawsuits Colorado has filed against the Trump administration so far
- Case here: State of New York vs. Donald J. Trump, District Court, S.D. New York
Weiser sued to block Trump’s demand that states turn over personal information about people enrolled in the Supplemental Nutrition Assistance Program, known as SNAP.
- Read more: Colorado jumps onto lawsuit against USDA over demand for personal information of SNAP recipients
- Case here: State of California vs. United States Department of Agriculture, District Court, N.D. California
Elections
Weiser sued to block Trump’s attempt to withhold funding to states that do not require proof of citizenship to register to vote and vote and require all ballots be counted on Election Day (many states allow ballots that arrive by mail after Election Day to be counted as long as they were postmarked by Election Day).
Federal employee firings
Weiser sued to block Trump’s attempt to close several federal agencies, including the Institute of Museum and Library Services.
Weiser sued to block Trump’s attempt to cut staff at the U.S. Department of Health and Human Services.
Funding cuts
Weiser sued to block Trump’s attempts to:
- Freeze federal funding.
- Cut National Institute of Health pay for research universities and medical schools.
- End COVID-related grants.
- Reduce AmeriCorps workforce.
- Withhold transportation funding from states that did not help the feds enforce immigration law.
- Cut Department of Defense research grants to universities.
- Withhold U.S. Department of Education funding for after school, summer and other education programs.
- End a FEMA grant program to strengthen infrastructure before disasters.
- Place immigration enforcement conditions on Homeland Security funds.
- Cut federal funding for state energy programs.
- Place immigration enforcement conditions on U.S. Department of Justice grants for crime victims and survivors.
- Suspend during the government shutdown the Supplemental Nutrition Assistance Program.
- Cut teen sexual health education programs from states unless they remove language about gender identity.
- Cut U.S. Department of Education funding for mental health services.
- Restrict federal funding for survivors of domestic violence and other violent crimes who are undocumented immigrants.
- Cut off Supplemental Nutrition Assistance Program benefits for lawful permanent residents.
- Interfere with federal grants for emergency management, disaster-relief, and homeland security operations.
Transgender rights
Weiser sued to block Trump’s attempt to ban transgender youth medical care and treatment.
- Read more: Two Colorado hospitals to resume gender-affirming care for youth
- Case here: State of Washington, et al. vs. Trump, Court of Appeals for the Ninth Circuit
Health care
Weiser sued to overturn Trump’s blocking of Medicaid payments to Planned Parenthood clinics.
Housing
Weiser sued to block the U.S. Department of Housing and Urban Development from reducing funding available for housing for people experiencing homelessness.
● 8 Weiser cases not blocking Trump policy (for now)
Federal employee firings
Weiser sued to block Trump’s mass firing of federal employees.
Weiser sued to block Trump’s mass firing of U.S. Department of Education employees.
Funding cuts
Weiser sued to block Trump’s attempt to eliminate K-12 teacher training grants.
- Read more: Colorado, seven other states sue Trump administration after abrupt end to teacher training grants
- Case here: State of California vs. U.S Department of Education, District Court, D. Massachusetts
Weiser sued to block Trump’s cuts to programs and grants from the National Science Foundation.
Weiser sued to block Trump’s delay of medical research grants.
Weiser sued to block Trump’s attempts to withhold education funding from agencies that did not end DEI initiatives.
Tariffs
Weiser sued to block Trump’s attempt to impose tariffs without approval from Congress.
Healthcare
Weiser sued to block Trump’s changes to Affordable Care Act enrollment.
- Case here: State of California vs. Centers for Medicare & Medicaid Services, District Court, D. Massachusetts
● 11 Weiser cases pending rulings
Climate and environment
Weiser sued to restore funding for two grant programs established by the Bipartisan Infrastructure Law in 2021 aimed at bolstering electric vehicle charging networks.
- Case here: State of California v. United States Department of Transportation, District Court, W.D. Washington
Weiser sued to overturn Trump’s plan to ban California’s rule banning the sale of new gas-powered cars by 2035.
Funding cuts
Weiser sued to block Trump’s cuts to federal agencies using an obscure federal regulation.
- Case here: State of New Jersey v. U.S. Office of Management and Budget, District Court, D. Massachusetts
Weiser sued to block Trump’s cancellation of a $7 billion solar program.
Weiser sued the Trump administration for damages, interest and fees related to its cancelation of solar grants.
Weiser sued to block the Trump administration’s efforts to dismantle the Consumer Financial Protection Bureau.
Gun regulations
Weiser sued to block Trump’s plan to allow the sale of forced-reset triggers that make semiautomatic rifles fire more rapidly.
Elections
Weiser sued to block Trump’s announced move of U.S. Space Command from Colorado Springs to punish Colorado for its vote by mail system.
- Read more: Colorado attorney general sues Trump administration over Space Command HQ relocation to Alabama
- Case here: State of Colorado, The v. Trump, District Court, D. Colorado
Education
Weiser sued to block a Trump policy that restricts eligibility for a federal program allowing student loan relief for government and nonprofit employees.
- Case here: Commonwealth of Massachusetts v. U.S. Department of Education, District Court, D. Massachusetts
Immigration
Weiser sued to block a Trump policy imposing a $100,000 fee on new H-1B visa petitions.
Transgender rights
Weiser sued to challenges a Trump administration policy seeking to ban health care providers who provide gender-affirming care from Medicare and Medicaid programs.
This story will be updated as Weiser brings more cases and as court decisions occur.