[Source](https://justthenews.com/government/federal-agencies/senior-wh-aide-lindsey-halligan-sworn-interim-us-attorney-eastern) > Senior White House aide Lindsey Halligan was sworn in as the interim U.S. attorney for the Eastern District of Virginia. > Halligan, who was previously President Trump's defense lawyer, started her new position on Monday, CBS News reported. Trump appointed her to the position after U.S. Attorney Erik Siebert said he resigned on Friday for fear of being forced out over failing to prosecute New York Attorney General Letitia James for alleged mortgage fraud. Trump said that he had fired Siebert. > Per federal law, Halligan can only serve as interim U.S. attorney for 120 days, unless federal judges for that district court extend her appointment or she is confirmed by the Senate.