Rep. Eric Swalwell (D-Calif.) on Tuesday mocked President Trump for claiming that George Papadopoulos was a "low level volunteer."

"That time a 'low level volunteer named George' sat between the next president & attorney general. #TrumpRussia," Swalwell tweeted.

That time a “low level volunteer named George” sat between the next president & attorney general. #TrumpRussia pic.twitter.com/L2i0YUoWBs — Rep. Eric Swalwell (@RepSwalwell) October 31, 2017

Trump on Tuesday lashed out on Twitter following reports Papadopoulos pleaded guilty to lying to FBI agents who are investigating possible collusion between the Trump campaign and Russia.

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"Few people knew the young, low level volunteer named George, who has already proven to be a liar," Trump tweeted, before calling for people to focus on tax reform and "Democrat corruption."

Papadopoulos, a 30-year-old foreign policy adviser, was arrested in July and pleaded guilty earlier this month.

The Justice Department unsealed the documents shortly after it announced charges against two other Trump campaign officials: former campaign chairman Paul Manafort and Manafort's onetime business partner, Richard Gates.

Papadopoulos was charged with lying to investigators about his conversations with a foreign professor who told him Russians had thousands of emails containing "dirt" on Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE.