President Donald Trump threatened to take over Washington, D.C., policing again over Mayor Muriel Bowser's refusal to allow officers to cooperate with Immigrations and Customs Enforcement agents in the district.

The threat is the latest in a series of escalations that began with the US president’s deployment of National Guard troops to fight crime.

U.S. President Donald Trump said on Monday he would call a national emergency and federalize Washington, D.C.