President Donald Trump announced Monday that he is federalizing the Washington, D.C., Metropolitan Police Department to address a “public safety emergency,” a move that will give him complete law enforcement control over the district.

P resident Trump said Monday he would take command of Washington, D.C.’s local police force, known as the Metropolitan Police Department, under a rarely cited provision of a 1973 federal law granting home rule to the capital city’s residents. Here’s what to know about Trump’s unprecedented move.

Trump mentioned New York, Baltimore, and Oakland as other cities where he wants to put the police under federal control. “This will go further," he said.