The Washington, D.C., attorney general sued the Trump administration Friday, alleging the president has overstepped his authority in a takeover of the Metropolitan Police Department—legal action that comes a day after the Trump administration attempted to effectively replace D.C.’s police commissioner with a federal official.

The showdown in Washington is the latest attempt by Trump to test the boundaries of his legal authority to carry out his tough-on-crime agenda, relying on obscure statutes and a supposed state of emergency to speed up the mass deportation of people in the United States illegally.

D.C. Mayor Muriel Bowser and D.C. Attorney General Brian Schwalb are forcefully rejecting U.S. Attorney General Pam Bondi’s late-night order attempting to sideline the local D.C. police chief, calling it unlawful and beyond federal authority.