In addition to the report outlining how the president attempted to obstruct justice, it shone light on the culture of lying that runs rampant in the White House, frequently led by Press Secretary Sarah Huckabee Sanders.
"Not only does she not have credibility, she lied", Ryan said on a CNN panel Thursday night, during a discussion about Sanders' 2017 usage of the word "countless" when referring to Federal Bureau of Investigation agents who had lost confidence in their former boss, James Comey.
According to the report, the false statements that drew the Mueller team's attention were made in May 2017, when Sanders sought to defend Trump's firing of Comey, CNN reported.
According to the report, "Sanders told this Office that her reference to hearing from "countless members of the FBI" was a 'slip of the tongue'".
While Mueller found no criminal evidence that Trump or his campaign aides colluded in Russian election meddling and did not recommend obstruction charges against the president, the 448-page report released Thursday nonetheless paints a damaging picture of the president, describing numerous cases where he discouraged witnesses from co-operating with prosecutors and prodded aides to mislead the public on his behalf to hamper the Russia probe he feared would cripple his presidency.
So there it is - "not founded on anything" - a remarkable admission from a government official who is paid to communicate accurately with the public. "She needs to go".
He also called for her White House press credentials to be yanked.
"Why can't you acknowledge that what you said then was not true?" he prodded her during the Friday segment.
Sanders, no longer under oath, doubled down on her original lie in her interview with Good Morning America. Should Sarah Sanders hold another, she can expect to spend it in the hot seat. "And the people, the American people can't trust her".
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Sanders replaced Spicer as White House press secretary in July 2017.
MSNBC's Mika Brzezinski tweeted, "Sarah Sanders lying and doubling down on it".
Sanders stopped holding daily press briefings a year ago.
In another section, Mueller details how Trump questioned McGahn's note-taking, telling the White House counsel that, "Lawyers don 't take notes" and that he'd "never had a lawyer who took notes".
There have only been two briefings so far this year, and the last one took place 38 days ago.
Sanders told Fox News host Sean Hannity on Thursday night that she was wrong to use the word "countless", but did say it was "not untrue" that "a number of current and former Federal Bureau of Investigation agents agreed with the president" about Comey while referring to him as a "disgraced leaker". When asked by ABC News' George Stephanopoulos about her remarks on Friday, she said: "It was in the heat of the moment, meaning that it wasn't a scripted talking point".
"Will you get into heaven?"
MS. SANDERS: Well, I can speak to my own personal experience. "I mean, I have heard from a large number of individuals that work at the Federal Bureau of Investigation that said that they're very happy with the president's decision". Mueller said that while it appeared Trump knew Cohen was lying to Congress, "the evidence available to us does not establish that the president directed or aided Cohen's false testimony". And that's just myself. She characterized her lie and smear of Comey as "a slip of the tongue".
But she briefly addressed the matter during an appearance with Sean Hannity on Fox News. "James Comey was a disgraced leaker who tried to politicise and undermine the very agency he was supposed to run".