According to Washington Post journalist Glen Kessler, the group was spotted in McLean, Virginia on Saturday afternoon by a neighbor, who claimed they were there to express frustration that Barr is 'not doing enough to lock up Joe Biden.’
The Justice Department said that Barr went outside to greet the crowd and chatted with them amiably, according to AP reporter Mike Balsamo.
Photos show that one of the protesters had a white horse in the suburban neighborhood, for reasons that were unclear.
Barr explained to the protesters what the DOJ’s role is generally in investigations and then shook hands and posed for photos with the crowd, the DOJ official said.
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President Donald Trump has repeatedly expressed frustration that the DOJ has not taken harsher action against Democrats, particularly in U.S. Attorney John Durham's investigation into the origins of the Russian collusion probe.
Trump was reportedly appalled when he learned that Durham would not be announcing any major indictments prior to the November 3 election.
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'This is major corruption and this has to be known about before the election,' Trump said in a call-in appearance.
After issuing his demand to Barr, Trump immediately segued into to the elections, saying: 'And by the way, we're doing very well. We're going to win the election.'
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In the closing days of the campaign, Trump has turned his frustrations toward Biden himself, after the New York Post reported on documents detailing the Biden family's foreign business dealings.
'He is a criminal. He's a criminal. He got caught – read his laptop,' Trump said, in reference to Hunter Biden's laptop.
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'Let me tell you something, Joe Biden is a criminal and he's been a criminal for a long time, and you're a criminal and the media for not reporting it,' Trump told reporters at a rally earlier this month.
'Lock him up!' has become a standard chant at Trump rallies in recent weeks, in reference to Biden.
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Saturday was not the first time protesters have gathered outside Barr's home in McLean.
In August, left-wing activists gathered there to accuse Barr of corruption in his role as the federal government's top law enforcement officer.
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Those protesters began banging on pots and pans outside Barr's home at 7am on a Saturday, blasting him for not supporting Black Lives Matter protests and enabling 'fascism'. In that case, Barr did not go outside to greet the protesters.