President Trump is preparing to push out a national security official who testified against him during the impeachment inquiry after he expressed deep anger on Thursday over the attempt to remove him from office because of his actions toward Ukraine.

Lt. Col. Alexander Vindman — a National Security Council aide who testified during House Democrats’ impeachment hearings — will be informed in the coming days, likely on Friday, by administration officials that he is being reassigned to a position at the Defense Department, taking a key figure from the investigation out of the White House, according to two people familiar with the move who spoke on the condition of anonymity because they were not authorized to discuss personnel decisions.

Vindman had already informed senior officials at the NSC that he intended to take an early exit from his assignment and leave his post by the end of the month, according to people familiar with his decision, but Trump is eager to make a symbol of the Army officer soon after the Senate acquitted him of the impeachment charges approved by House Democrats.