President Donald Trump said Monday he is placing Washington, DC’s, police department “under direct federal control” and deploying National Guard troops to the nation’s capital, citing a public safety emergency after an assault on a former government worker.

Some of the 800 National Guard members deployed by President Donald Trump began arriving in Washington D.C. on Tuesday, ramping up after the White House ordered federal forces to take over the city’s police department and reduce crime in what the president called — without substantiation — a lawless city.