Still, Monday’s tweets by the president went further than before in attempting to undermine the legal basis for the investigation into whether people on Mr. Trump’s campaign colluded with Russian meddling during the election, and whether anyone in the administration tried to cover up their activities.
The president’s assertions came in tweets just a day after Rudolph W. Giuliani, one of his lawyers, told HuffPost that Mr. Trump is essentially immune from prosecution while in office, and could even have shot the former F.B.I. director without risking indictment while he was president.
Mr. Giuliani also said over the weekend that the president “probably” has the power to pardon himself, but said on NBC’s “Meet the Press” that it would be “unthinkable” for him to do so.
Doing so, Mr. Giuliani said, would “lead to probably an immediate impeachment,” adding that he “has no need to do that. He didn’t do anything wrong.”
Mr. Trump’s statement about pardons on Twitter went further than Mr. Giuliani and raises the prospect that the president might try to test the limits of his pardon power if Mr. Mueller, tried to indict him for obstruction of justice in the case. Mr. Mueller has indicated he does not plan to seek an indictment, according to Mr. Giuliani.
In his tweet, Mr. Trump again called the investigation a “never ending Witch Hunt” and said it is being led by “13 very Angry and Conflicted Democrats.”