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Mayor Muriel Bowser at a Dec. 14 press briefing in Washington, D.C. Photo: Jacquelyn Martin/pool/AFP via Getty Images

Washington, D.C., Mayor Muriel Bowser urged city residents to avoid travel downtown on Tuesday and Wednesday, and she's activated the National Guard in response to planned mass demonstrations by Trump supporters this week as Congress is set to certify Joe Biden's win.

The big picture: Trump has pushed his supporters through tweets to show up and protest his false and unsubstantiated claims of Democrats interfering with election results on Wednesday. D.C. was the scene of violence following a pro-Trump event in mid-December where several people were stabbed.

What they're saying: Bowser asked those in the region to avoid engaging "with demonstrators who come to our city seeking confrontation," adding, "we will do what we must to ensure all who attend remain peaceful.”   

  • "We will not allow people to incite violence, intimidate our residents or cause destruction in our city," she said.

Go deeper

In photos: D.C. and U.S. states on alert for pre-inauguration violence

National Guard troops stand behind security fencing with the dome of the U.S. Capitol Building behind them, on Jan. 16. Photo: Kent Nishimura / Los Angeles Times via Getty Images

Security has been stepped up in Washington, D.C., and state capitols across the U.S. as authorities brace for potential violence this weekend.

Driving the news: Following the Jan. 6 insurrection at the U.S. Capitol by some supporters of President Trump, the FBI has said there could be armed protests in D.C. and in all 50 state capitols in the run-up to President-elect Joe Biden's inauguration Wednesday.

Read: Pete Buttigieg's opening statement ahead of confirmation hearing

Pete Buttigieg, President Biden's nominee to be secretary of transportation, in December. Photo: Kevin Lamarque/AFP via Getty Images

Pete Buttigieg, President Biden's nominee to lead the Transportation Department, will tell senators he plans to prioritize the health and safety of public transportation systems during the pandemic — and look to infrastructure projects to rebuild the economy — according to a copy of his prepared remarks obtained by Axios.

Driving the news: Buttigieg will testify at 10 a.m. ET before the Senate Committee on Commerce, Science and Transportation. He is expected to face a relatively smooth confirmation process, though GOP lawmakers may press him on "green" elements of Biden's transportation proposals.

Off the Rails

Episode 8: The siege

Photo illustration: Aïda Amer/Axios. Photos: Mandel Ngan/AFP via Getty Images

Beginning on election night 2020 and continuing through his final days in office, Donald Trump unraveled and dragged America with him, to the point that his followers sacked the U.S. Capitol with two weeks left in his term. Axios takes you inside the collapse of a president with a special series.

Episode 8: The siege. An inside account of the deadly insurrection at the Capitol on Jan. 6 that ultimately failed to block the certification of the Electoral College. And, finally, Trump's concession.

On Jan. 6, White House deputy national security adviser Matt Pottinger entered the West Wing in the mid-afternoon, shortly after his colleagues' phones had lit up with an emergency curfew alert from D.C. Mayor Muriel Bowser.