At an extraordinary news conference on Monday, President Donald Trump revealed plans to take over the Washington, D.C. police department and deploy National Guard troops in the nation's capital to combat what he says it rampant violent crime that statistics show is actually decreasing.

A federal judge in San Francisco will hear arguments on whether military troops deployed this summer by the Trump administration to Los Angeles violated a federal law that bars troops from conducting law enforcement duties within the country.

U.S. President Donald Trump said on Monday he was deploying 800 National Guard troops to Washington and temporarily taking over the city's police department, an extraordinary assertion of presidential power in the nation's capital.