The Times reported that McGahn's cooperation in the investigation began in part because the president's initial team of lawyers insisted that Trump had nothing to hide and they wanted the investigation to end quickly.
President Donald Trump lashed out at John Brennan in the latest effort to counter criticism of his decision to revoke the former USA spy-in-chief's security clearance. "Oh my God, it would have been phenomenally helpful to us".
The president tweeted Saturday evening that he "allowed White House Don McGahn, and all other requested members of the White House Staff, to fully cooperate with the Special Counsel".
President Donald Trump boards Air Force One at Andrews Air Force Base, Md., Aug. 17, 2018.
Some members of the media are very Angry at the Fake Story in the New York Times.
People close to McGahn also said he grew concerned Trump had chose to allow him to cooperate in the investigation to construct a defense that he was following McGahn's poor legal advice on decisions such as the Comey firing, which could be viewed as obstruction of Justice, according to the report.
"No Collusion and No Obstruction, except by Crooked Hillary and the Democrats. So bad for America!", Trump said.
Mueller, who is investigating allegations of Russian meddling in the 2016 US election, learned of the incident in subsequent months as his investigators interviewed current and former senior White House officials in an inquiry into whether the president obstructed justice.
"Mr. McGahn and his lawyer, William A. Burck, could not understand why Mr. Trump was so willing to allow Mr. McGahn to speak freely to the special counsel and feared Mr. Trump was setting up Mr. McGahn to take the blame for any possible illegal acts of obstruction, according to people close to him".
Mueller had requested to speak with McGahn about the circumstances surrounding former FBI Director James Comey's firing and his reported involvement in the event surrounding Attorney General Jeff Sessions' recusing himself from the Russian Federation investigation, the sources said.
That letter followed a scathing op-ed published in the Washington Post from the retired admiral who oversaw the capture of Osama Bin Laden.
Joseph McCarthy "look like a baby".
Joseph McCarthy, who died at the young age of 48, rose to prominence in the 1950s after he made a claim that 205 communists had infiltrated the United States State Department.
The newspaper said Mr. McGahn was also centrally involved in Mr. Trump's attempts to fire the special counsel, Robert Mueller, which investigators might not have discovered without him.
Also Sunday, Giuliani claimed "truth isn't truth" in describing why his client should not meet with the special counselor.
"The president encouraged him to testify, is happy that he did, is quite secure that there is nothing in the testimony that will hurt the president", Giuliani said on NBC's "Meet the Press".