Washington — Lindsey Halligan, one of President Trump's former defense lawyers who then joined him in the White House, took over a key federal prosecutor's office in Virginia on Monday following the departure of the U.S. attorney amid apparent pressure from the president.

Halligan takes the helm of the U.S. Attorney's Office for the Eastern District of Virginia as interim U.S. attorney after serving as a senior aide to Mr. Trump. Her temporary appointment comes days after Erik Siebert, who had been serving as the top prosecutor in the office, resigned amid concerns he would be forced out for failing to prosecute New York Attorney General Letitia James for alleged mortgage fraud. The president said he fired Siebert.

Federal law allows Halligan to serve as interim U.S. attorney for on

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