Washington is seeking an emergency restraining order against President Donald Trump’s takeover of its police department.

DC Attorney General Brian Schwalb filed a lawsuit Friday against the Trump administration over its moves to take over the city’s police department and appoint an emergency commissioner, the latest sign of pushback from district officials against the federal takeover.

The suit, filed in federal court, is the biggest pushback from city officials since President Donald Trump invoked a provision of the Home Rule Act — the 1970s law that allows for limited self-governance by D.C.’s government — which allows the president to request MPD’s services to address “special conditions of an emergency nature.”