Donald Trump has reportedly been yelling at TV sets in the White House as he becomes "increasingly angry" about an investigation into alleged Russian meddling in the US presidential election.
The US leader thinks he is the victim of a conspiracy aimed at discrediting his leadership and ending his time in the White House, according to the Associated Press.
Confidants and advisers close to Mr Trump said his fury was mounting at the probe and he had been yelling at TV sets about its press coverage.
The US president admitted that he is under federal investigation in a Twitter post, writing: “I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director! Witch Hunt.”
He appeared to be referring to Rod Rosenstein, deputy attorney general who is currently leading the probe.
Mr Rosenstein played a part in the dismissal of former FBI director James Comey who was fired by Mr Trump in May.
He had written a memorandum to US Attorney General Jeff Sessions, criticising Mr Comey about the way in which he handled the Russia investigation.
The White House initially said the memo was critical to the decision, but Mr Trump later later said it was irrelevant, because he’d made up his mind beforehand.
Mr Trump was criticised for the tweet by the senior Democrat on the Senate Judiciary Committee, Dianne Feinstein.
“The message the president is sending through his tweets is that he believes the rule of law doesn't’ apply to him and that anyone who thinks otherwise will be fired," she said.
She added that she was “increasingly concerned” Mr Trump will fire both [investigative special counsel] Robert Mueller and Rosenstein.”
The President has been advised, on numerous occasions, to avoid commenting on both the Russian probe and social media.
But he has so far refused to curtail his social media postings.
Earlier this week, he wrote: "They made up a phony collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phony story. Nice."
Mr Rosenstein has previously said that “if anything that I did winds up being relevant to his investigation then, as Director Mueller and I discussed, if there’s a need from me to recuse, I will.”
Vice President Mike Pence has hired a private lawyer to represent his interests in the probe.