The White House press secretary, Sarah Huckabee Sanders, said that the president was proved right in firing the F.B.I. director in May.
The regret is one of a catalog of mistakes — large and small — that Mrs. Clinton lists in the election post-mortem “What Happened.”
The special counsel, Robert S. Mueller III, has a copy of a letter President Trump wanted to send to James Comey explaining the rationale for firing him. The White House counsel blocked the president from sending the letter.
President Trump charged that James B. Comey had “exonerated” his opponent Hillary Clinton before completing an investigation.
The vice president, a likely witness in the various investigations encircling the White House, has hired a former United States attorney as private counsel.
The president was dismissive about new reports that Robert S. Mueller III, the special counsel, is looking into whether he tried to obstruct justice.