On Thursday, Barr claimed in a contentious press conference that Mueller found no evidence of collusion between members of Donald Trump's presidential campaign and the Russians during the 2016 election.
"After nearly two years of investigation, thousands of subpoenas, and hundreds of warrants and witness interviews, the Special Counsel confirmed that the Russian government-sponsored efforts to illegally interfere with the 2016 presidential election but did not find that the Trump campaign or other Americans colluded in those schemes," Barr said, adding that Americans "should be grateful" for the findings.
Celebrities went wild at both the report's release and Barr's proclamations.
Chelsea Handler retweeted an NPR excerpt of the Mueller report.
Rosie O'Donnell posted a series of tweets, retweets and replies immediately after the news broke:
Sharing her frustrations was fellow "The View" panelist and outspoken conservative Ana Navarro:
Debra Messing concurred with Navarro:
Ron Perlman tweeted, "He was obstructing then, he is obstructing now. Welcome, Billie Barr, to team obstruction! On a side note... For a rookie ya look like s—t!"
Actress Patricia Arquette also spoke out numerous times mocking Barr:
Rob Reiner wouldn't be convinced of the president's innocence:
"Meet the Press" host Chuck Todd questioned the ease with which the Russians allegedly hacked the 2016 election.
Alyssa Milano retweeted a post from Chuck Schumer:
More celeb reactions below:
Fox News' Brooke Singman contributed to this report.