The event in Phoenix featured several Democratic state attorneys general, including Arizona Attorney General Kris Mayes.
Impeachment likely won't happen, but the idea is gaining traction as Republicans question the country's typical separation of powers.
Outside groups from across the ideological spectrum have spent decades documenting questionable government spending.
Arizona Attorney General Kris Mayes and other AGs are suing DOGE over federal worker layoffs and program cuts. Over 100,000 workers have been laid off, impacting community health services.
Oregon's attorney general was one of four who vowed at a town hall in Phoenix that they would continue to fight back against sweeping federal cuts by President Donald Trump and his ally, Elon Musk.
They said the president was ignoring judges who blocked his executive orders and harming former service members.