Legal experts have suggested Barr's response has new significance in light of President Donald Trump saying he would take opposition research from a foreign government.
"It is almost unheard of for the Justice Department to release raw evidence to another entity so that the Justice Department can be second guessed," Andrew Napolitano said.
The Judiciary Committee says it's reached a long sought-after deal with the Justice Department to begin receiving underlying evidence from the Mueller report.
William Barr "thinks that he's a hero for helping to destroy the credibility of the DOJ," one user tweeted.
"I had the thought that my arrival this time felt a little bit, I think, like jumping into Sainte-Mère-Église," he said.
The nation's top law enforcement official and his DOJ legal team determined the president did not violate the law, going a step further in an interview to say that much of Mueller's legal analysis "did not reflect the views of the department."
"These facts that he laid out are so substantially similar to the matured allegations against Bill Clinton and Richard Nixon, it's clear where he was going," Andrew Napolitano explained.
"It was not anywhere as clear cut as Attorney General Bill Barr [characterized the report]," the political anchor said. "In fact, it was almost exactly the opposite, not clear cut."
"Attorney General Barr has deliberately misrepresented key aspects of Mueller's report and decisions in the investigation, which has helped further the president's false narrative," Representative Justin Amash wrote on Twitter.
"Some say this proves that the Trump administration is lawless. Not surprisingly, I disagree," Attorney General William Barr said while addressing the American Law Institute.
On Saturday, Amash became the first Republican member of Congress to publicly argue that Trump engaged in impeachable conduct while in the Oval Office.
Fox News host Jeanine Pirro used her Saturday evening show to rail against the "Deep State" and what she claims is a massive federal government conspiracy against President Donald Trump.
Barr said the American public should know what the government was doing before the 2016 election.
The "Ferris Bueller's Day Off" star kept talking through the interview, despite his phone ringing in the background.
The veteran journalist said the situation challenged "whether our institutions are able to function in this country to deal with a president of the United States who is unique in our history, who has nothing but contempt for Democratic traditions and the rule of law."
"[Trump] doesn't seem to understand that a fundamental aspect of his job is to try to make us a more perfect union," the congressman said.
"And Republicans are cutting the power," S.E. Cupp alleged.
"It was misleading, disingenuous and deceptive," former judge Andrew Napolitano wrote about William Barr's summary.
"He will come at some point. If necessary, we'll subpoena him, and he will come," said the House Judiciary chairman.
"He certainly had read the newspaper reports of the complaints and he had a letter from Mueller himself complaining," Andrew Napolitano, a former judge, said.
"We are now in a constitutional crisis," said House Judiciary Chairman Jerrold Nadler.
"If it weren't for him being president, [Trump] would be in prison with Michael Cohen today," Democrat Steve Cohen said.
"Right now, all systems go for the contempt hearing," Representative Jamie Raskin, a Judiciary Committee member, told Newsweek after meeting with the panel's chairman and other members.
"It seems that individuals in the Justice Department at the highest levels who seem to state the facts and the law as they exist seem to not do well," said former Deputy Assistant Attorney General Elliot Williams.
"I believe that the FBI is engaged in investigative activity and part of investigative activity includes surveillance activity of different shapes and sizes," Christopher Wray said during a Senate Appropriations subcommittee hearing.
"And the judiciary is the branch that decides what the law means, what the Constitution means and how it should be interpreted," the former judge continued, "rather than these threats about locking up the attorney general."
The move came after the attorney general failed to provide the committee with a response by the 9 a.m. Monday deadline set by Judiciary Chairman Jerrold Nadler, who issued a subpoena for the full Mueller report and its underlying evidence.
"One of my staffers went out the night before and got some KFC," Rep. Steve Cohen (Tenn.) said. "Another staffer brought in the porcelain ceramic chicken."
"Are they looking for a redo because they hated seeing the strong NO COLLUSION conclusion? There was no crime," the president insisted on Twitter.
"It's time to investigate the beginning of the coup and who in the DOJ, FBI and White House signed on to prevent and overturn the will of the American people. Grab your popcorn, folks. It's showtime," Pirro said.