WASHINGTON — President Donald Trump announced on Saturday that he intends to nominate Lindsey Halligan, a senior aide at the White House, to be the lead federal prosecutor for the Virginia office. This office faced upheaval following the departure of its U.S. attorney on Friday.

In a social media update after leaving the White House for an event at Mount Vernon, Trump revealed his plan to nominate Halligan as the U.S. attorney for the Eastern District of Virginia. He described her as someone who “will be Fair, Smart, and will provide, desperately needed, JUSTICE FOR ALL!”

The announcement coincided with Trump’s urging of Attorney General Pam Bondi to advance cases against some of his political adversaries, fulfilling a pledge of retribution that has been integral to his political comeback.

If confirmed, Halligan would oversee an office currently facing political pressure from Trump administration officials to file criminal charges against New York Attorney General Letitia James, a prominent Trump critic, in a mortgage fraud investigation.

Erik Siebert, who previously led the office, resigned as Trump administration officials pushed for charges related to alleged discrepancies in the paperwork for James’s properties in Brooklyn and Virginia.

The Justice Department has been probing these issues for months without finding sufficient incriminating evidence to proceed with an indictment. James’s attorneys have strongly refuted the allegations, dismissing the investigation as politically motivated.

Halligan has been part of Trump’s legal orbit for the last several years, including serving as one of his attorneys in the early days of the FBI’s investigation into Trump’s retention of classified documents at his Mar-a-Lago estate in Florida. She has more recently been enlisted in a White House effort to remove what the administration contends is “improper ideology” from Smithsonian properties.

Earlier Saturday, Trump posted to social media what appeared to be somewhat of an open letter to Bondi, saying he had “reviewed over 30 statements and posts” that he characterized as criticizing his administration for a lack of action on investigations, including the one into James’ dealings. Trump’s message mentioned former FBI Director James Comey, Trump’s longtime foil whom he fired during his first term amid the Russia election interference investigation.

The FBI acknowledged this summer that it was investigating Comey, who was interviewed by the Secret Service after an Instagram post that Republicans insisted was a call for violence against Trump. Comey has said he did not mean the post as a threat and removed it once he realized how it was being interpreted.

Asked as he departed the White House if he was criticizing Bondi, Trump said he just wanted action.

“We have to act fast – one way or the other,” Trump said. “They’re guilty, they’re not guilty – we have to act fast. If they’re not guilty, that’s fine. If they are guilty or if they should be charged, they should be charged. And we have to do it now.”

In announcing Halligan’s nomination soon after on social media, Trump said that Bondi was “doing a GREAT job.”

The selection of Halligan came just hours after another conservative lawyer, Mary “Maggie” Cleary, said in an email to staff that she had been named acting U.S. attorney for the Eastern District of Virginia, according to a copy viewed by The Associated Press.

“While this appointment was unexpected, I am humbled to be joining your ranks,” Cleary, a conservative lawyer who has said she was falsely accused of being at the U.S. Capitol on Jan. 6, 2021, told employees in the email.

While Siebert said in an email to colleagues Friday evening that he had submitted his resignation, Trump said in a social media post: “He didn’t quit, I fired him!” Trump noted he was backed by the state’s two Democratic senators, Mark Warner and Tim Kaine, adding: “Next time let him go in as a Democrat, not a Republican.”

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Associated Press writer Eric Tucker contributed to this report.