Around 2 a.m., noisy revelers emerging from clubs and bars packed the sidewalks of U Street in Washington, many of them seeking a late-night slice or falafel. In short, that law enforcement surge to take control of the District of Columbia's streets did not appear to unfold on schedule.

President Donald Trump on Wednesday suggested he may use the National Guard to police the streets of Washington, D.C., in his latest threat to take over running the city that serves as the seat of the U.