McGahn's attorney William Burck added in a statement: "President Trump, through counsel, declined to assert any privilege over Mr. McGahn's testimony, so Mr. McGahn answered the Special Counsel team's questions fulsomely and honestly, as any person interviewed by federal investigators must".
President Trump speaks to the media on the South Lawn of the White House in July.
And former administration officials said it's unlikely that McGahn would still be serving in his top position in the administration if he had actually shared incriminating information about the president with Robert Mueller's team. "Study the late Joseph McCarthy", the president wrote of the Wisconsin senator who led efforts to criminalise "un-American" political beliefs, "because we are now in period with Mueller and his gang that make Joseph McCarthy look like a baby!"
Mr. Trump repeated that there's been "no collusion and no obstruction" on his part, and instead blamed "crooked" Democrats including Hillary Clinton as well as former members of the intelligence community. "This is why the Fake News Media has become the Enemy of the People. Rigged Witch Hunt!", Trump tweeted.
Giuliani says it's "silly" to say Trump should testify "because he's going to tell the truth and he shouldn't worry" because "it's somebody's version of the truth". Last month, Times publisher AG Sulzberger said he had asked the president to stop.
In his Twitter rant, Trump went 20 years back in time from Watergate, to the "red scare" of the 1950s. Joseph McCarthy (R-WI), a unusual analysis, given that Trump and McCarthy shared a lawyer, Roy Cohn, and given that, unlike McCarthy, Mueller has made nearly no public statements about his work outside of court.
The counter-punch comes after days of criticism from former USA national security officials and military leaders who've cast Trump's cancellation of Brennan's clearance - an apparent retaliation for his criticism of the president - as a unsafe precedent.
The article sent Trump's lawyers and advisers into a frenzy, leaving Trump to solicit opinions over the weekend "from a small group of advisers on the possible repercussions from the article", the Times reported Sunday.
The Times is reporting on Saturday that McGahn is the one who likely revealed the president's intent to fire Mueller. Brennan told NBC's Meet the Press he might take Trump to court.
Donald Trump has still not said when - or if - he might release his tax returns.
Essentially McCarthyism, is exactly what President Trump did in his tweet this morning, when he compared Robert Mueller to Joseph McCarthy. But it said another motivation was Mr. McGahn's fear that he could be placed in legal jeopardy because of decisions made in the White House that could be construed as obstruction of justice.