Trump's plan to address crime in D.C. calls for deploying National Guard troops along the National Mall overnight Wednesday into Thursday morning, according to a source.

Around two dozen soldiers stood guard outside Washington, Union Station in Washington, D.C., on Aug. 14. They had little to do.

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Trump invokes federal control over D.C. police amid crime surge, with National Guard spotted leaving armory as authorities arrest 23 suspects.

National Guard troops pulled up in front of the Washington Monument on Aug. 12. They weren't armed then, but they could be soon, Army officials said.

As the first of 800 Washington, D.C., National Guard members activated by President Donald Trump to assist with law enforcement in the nation's capital began to arrive Tuesday, they were still waiting to hear from law enforcement what their mission would be.

National Guard troops scaled up their presence in D.C. Thursday, with several stationed around the National Mall, at Union Station, on the subway, and other places.