Arizona Attorney General Kris Mayes is protecting the Rule of Law and the U.S. Constitution on behalf of Arizonans:
| Date Filed | Case Name | Summary | AG Press Releases | AG Video | Additional Updates (externally updated) |
| 1 | 1/21 | Washington et al. v. Donald Trump | Arizona joined Washington, Oregon, and Illinois challenging President Donald Trump’s unconstitutional order attempting to unilaterally strip citizenship from citizens across the United States. If allowed to stand, the unconstitutional order would cause thousands of newborns and children in Arizona to lose their ability to fully and fairly participate in our society as citizens, despite the Constitution’s guarantee of their citizenship. Arizona would also lose hundreds of millions of federal dollars for programs supporting the health and welfare of its residents. | 1/21/25, 1/23/25, 2/6/25 | Watch 1/21 Press Conference | [LINK] |
| 2 | 1/28 | New York et al. v. Donald Trump | Arizona and a coalition of 21 states filed this lawsuit to stop the implementation of a new Trump administration policy to withhold trillions of dollars in funding that every state in the country relies on to provide essential services to millions of Arizonans. Essential community health centers, addiction and mental health treatment programs, services for people with disabilities, and other critical health services are jeopardized by this policy. The lawsuit highlights the staggering threat to public safety if this pause goes into effect. Funds would be cut off for the High Intensity Drug Trafficking Area (HIDTA) program, which is Arizonans coordinated frontline effort with the federal government to combat the fentanyl crisis and battle the Mexican drug cartels. | 1/28/25, 1/31/25, 2/5/25, 2/7/25, 2/10/25, 2/28/25, 3/6/25, 3/25/25 | Watch 1/28 Press Conference | [LINK] |
| 3 | 2/7 | New York et al. v. Donald Trump | Arizona joined a coalition of 19 attorneys general suing the Trump administration to stop the unauthorized disclosure of Arizonans’ private information and sensitive data. The lawsuit seeks to prevent the Trump administration from illegally providing Elon Musk and the so-called “Department of Government Efficiency (DOGE)” unauthorized access to the Treasury Department’s central payment system, and therefore to Americans’ most sensitive personal information, including bank account details, Social Security numbers, and Veterans’ benefit information. | 2/6/25, 2/7/25, 2/8/25, 2/21/25 | Watch Attorney General's Message | [LINK] |
| 4 | 2/10 | Commonwealth of Massachusetts v. National Institutes of Health (NIH) | Arizona joined 21 other states in suing the Trump Administration, the Department of Health and Human Services, and the National Institutes of Health (NIH) for unlawfully cutting funds that support cutting-edge medical and public health research at universities and research institutions across the country. In Arizona, the University of Arizona received $170 million, ASU’s Tempe Campus was awarded over $65 million and NAU benefitted from $14 million in NIH funding in FY24. All of them would see their funding reduced under the new 15% rule. Private hospitals would also be impacted: Banner received $26 million, Mayo Clinic received $17 million, and St. Joseph’s received $10 million. They too would see their funding cut. | 2/10/25, 2/10/25, 3/5/25, | [LINK] | |
| 5 | 2/13 | New Mexico et al. v. Elon Musk | Arizona co-led 11 other states in filing a lawsuit challenging the unlawful delegation of executive power to Elon Musk. The lawsuit argues that President Trump has violated the Appointments Clause of the United States Constitution by creating a new federal Department without Congressional approval and by granting Musk sweeping powers over the entire federal government without seeking the advice and consent of the Senate. The lawsuit highlights how Musk has unraveled federal agencies, accessed sensitive data, and caused widespread disruption for state and local governments, federal employees, and the American people. | 2/13/25, | Watch Attorney General's Message | [LINK] |
| 6 | 3/7 | Maryland et al. v. U.S. Dept of Agriculture et al. | Arizona joined a coalition of states filing a lawsuit against numerous federal agencies for conducting illegal mass layoffs of federal probationary employees. These mass firings will cause irreparable burdens and expenses on the part of the states, both to support recently unemployed workers and to review and adjudicate claims of unemployment assistance. Moreover, the unlawful layoffs will harm state finances and undermine vital state-federal partnerships. The federal agencies named in the lawsuit failed to provide any advance notice to Arizona causing significant expense and burden on the state as it scrambles to respond to the sudden mass layoffs of its residents. | 3/7/25, 3/7/25, 3/14/25, 4/2/25 | [LINK] | |
| 7 | 3/13 | New York et al. v. Linda McMahon | Arizona joined 20 other states in suing to stop the targeted destruction of the U.S. Department of Education, a critical federal agency that ensures tens of millions of students receive a quality education and critical resources. Federal funds make up about 19% of public school funding in Arizona--that means 1 in every 5 dollars we spend on education is supplied through the Department of Education. In the 2021-22 school year, Arizona received $2.8 billion in federal funding and had over 1,150 schools that received Title I funding. | 3/13/25 3/24/25 5/22/25 | Watch 3/13/25 Press Conference | [LINK] |
| 8 | 4/1 | Colorado et al. v. DHHS, RFK Jr. | Arizona joined a coalition of 23 states filing a lawsuit against the U.S. Department of Health and Human Services and HHS Secretary Robert F. Kennedy, Jr., for abruptly and illegally terminating nearly $12 billion in critical public health grants to the states. Arizona stands to lose more than $239 million from these cancellations by HHS. If the funding is not restored, important state public health programs and initiatives will have to be dissolved or disbanded, including many healthcare providers’ jobs, rural public health funding, our effort to modernize our state’s outdated disease surveillance system - MEDSIS, vaccination efforts and our infectious disease fighting infrastructure. | 4/1/24, 4/5/25 | [LINK] | |
| 9 | 4/3 | California et al. v. Trump, Bondi et al. | Arizona joined a coalition of 19 states in filing a lawsuit against President Donald J. Trump, U.S. Attorney General Pam Bondi, the federal Election Assistance Commission, and other Trump Administration officials over Executive Order No. 14248 (the Elections Executive Order), an unconstitutional attempt to impose sweeping voting restrictions across the country. Among other things, the Elections Executive Order attempts to upend common-sense, well-established State procedures for counting ballots — procedures that make it easier for peoples’ voices to be heard. | 4/13/25 | Watch 4/3/25 Press Conference | [LINK] |
| 10 | 4/4 | Commonwealth of Massachusetts et al. V. RFK Jr, DHHS et al. | Arizona joined a coalition of 16 states in suing the Trump Administration in the U.S. District Court for Massachusetts over its unlawful attempt to disrupt grant funding issued by the National Institutes of Health (NIH). The lawsuit challenges the Administration’s unreasonable and intentional delays in reviewing NIH grant applications, as well as its termination of hundreds of already-issued grants. As a result of the Administration’s delays and terminations, the states allege that their public research institutions have experienced significant harm. For example, Arizona's research institutions are facing severe disruptions, with critical projects delayed or halted, hindering advancements in areas like cancer research and infectious disease control. | 4/4/25 | [LINK] | |
| 11 | 4/4 | Rhode Island et al. v. Trump, IMLS et al. | Arizona joined 20 other states in suing the Trump administration to stop the dismantling of three federal agencies that provide services and funding supporting public libraries and museums. In March, the Trump administration issued an Executive Order that would dismantle federal agencies created by Congress that collectively provide hundreds of millions of dollars for programs in every state. In Arizona, Institute of Museum and Library Services funding is vital to statewide initiatives and direct support for local libraries. The impact of funding cuts will go, but the consequences are already clear: contracts have been terminated for Arizona State Library Archives and Public Records staff who deliver Digital Navigator services, a support that many communities rely on. In 2024, this funding supported the Arizona Memory Project, Arizona Reading Program, connect Arizona, Summer Library Institute, and many more. | 4/4/25 | [LINK] | |
| 12 | 4/10 | New York et al. v. Dept. of Education, McMahon, et al. (RE: Education Stabilization Grants) | Arizona joined a coalition of 16 other states in suing the Trump administration to restore states’ access to critical Department of Education (ED) programs that support low-income and unhoused students and provide funding for other services to address the long-term effects of the COVID-19 pandemic on K-12 students. Attorney General Mayes and the coalition assert that ED’s arbitrary and abrupt termination of the states’ access to these funds is causing a massive, unexpected budget gap that will hurt students and teachers by cutting off vital education services. If access to this critical funding is not restored, states will be unable to provide essential public services, pay hundreds of public employees, or provide quality education to K-12 students. | 4/10/25 | ||
| 13 | 4/23 | Oregon et al. v. Trump, 1:25-cv-00077, (Ct. Intl. Trade) | Arizona co-led a coalition of states in filing a lawsuit to block President Trump’s illegal tariffs. The case challenges four of President Trump’s executive orders that claim the power to increase tariffs worldwide without congressional action. The lawsuit challenges President Trump’s executive orders calling for higher tariffs on most products worldwide. These tariffs impose a 145 percent tariff on most products from China, a 25 percent tariff on most products from Canada and Mexico, and 10 percent tariffs on most products from the rest of the world. It also challenges President Trump’s plan to raise tariffs on imports from 46 other trading partners on July 9. Experts estimate the tariffs will raise the cost of living for the average Arizona family by thousands of dollars a year. | 4/23/25 | Watch 4/23/25 Press Conference | [LINK] |
| 14 | 4/29 | Maryland et al. v. AmeriCorps (RE: AMERICORPS) | Arizona, as part of a multistate coalition, filed a lawsuit challenging the Trump Administration’s termination of AmeriCorps grants and the dismantling of the agency though an 85% reduction of its workforce, effectively ending the agency’s ability to continue administering the programs, operations, and funding that make its important work possible. Fourteen Arizona nonprofits and organizations are losing an estimated $6 million, including volunteer programs that address teacher shortages, support aging Arizonans, and tutor low-income students. | 4/29/25 | [LINK] | |
| 15 | 5/5 | New York et al. v. Kennedy | Arizona, as part of a multistate coalition, filed a lawsuit challenging against Secretary Robert F. Kennedy Jr., the U.S. Department of Health and Human Services (HHS), and other Trump administration officials to stop the dismantling of HHS. Since taking office, Secretary Kennedy and the Trump administration have fired thousands of federal health workers, shuttered vital programs, and abandoned states to face mounting health crises without federal support. | 5/5/25 | ||
| 16 | 5/5 | NY et al. v. Trump (Wind Energy) | Arizona, as part of a multistate coalition, joined a coalition of 18 attorneys general in filing a lawsuit against the Trump Administration over its unlawful attempt to freeze the development of wind energy. | 5/5/25 | ||
| 17 | 5/7 | State of Washington, et al. vs. US Department of Transportation | Arizona, as part of a multistate coalition, joined a lawsuit to stop the Trump administration from illegally terminating billions in congressionally approved funding for electric vehicle infrastructure. Unless the courts check the president’s overreach, Arizona stands to lose $48 million in electric vehicle infrastructure funding. | 5/7/25 | ||
| 18 | 5/9 | State of Washington, et al. v. Donald Trump and Daniel Driscoll (Energy Emergency) | Arizona, as part of a multistate coalition, joined a lawsuit to challenge President Trump’s fake “energy emergency,” declared to enrich Big Oil and gut environmental protections by fast-tracking polluting energy projects without proper review. | 5/9/25 |