Whitaker’s last day at the department was on Saturday, the spokeswoman said, adding she did not know where he might be headed next.
In mid-February, Attorney General William Barr was sworn in and Whitaker stepped down from the top post to become a senior counselor in the office of the associate attorney general.
In one of his final acts as acting attorney general, Whitaker testified before the House Judiciary Committee, where combative Democratic lawmakers pressed him on whether he had tried to interfere with Special Counsel Robert Mueller’s investigation into whether Trump’s campaign colluded with Russia.
Whitaker denied any interference and said he had not talked to Trump about the probe. Trump has denied colluding with Russia and has repeatedly called Mueller’s investigation a "witch hunt."
Whitaker first joined the Justice Department as former Attorney General Jeff Sessions’ chief of staff in the autumn of 2017. Trump handpicked him as acting attorney general in November after the president ousted Sessions.