The crowded hearing room in which former special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay MORE delivered his three-hour testimony broke into a rare bout of laughter Wednesday morning when Mueller joked that a lawmaker could get away with making false statements because "it's Congress."

"What if I had made a false statement to an investigator on your team — could I go to jail?" Rep. Sylvia GarciaSylvia GarciaThe Hill's Morning Report - Dems to lay out impeachment case to senators next week Seven things to know about the Trump trial House delivers impeachment articles to Senate MORE (D-Texas) asked Mueller.

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"Yes," Mueller replied. "Although, it's Congress, so…” he quipped. 

Mueller then grinned as the audience broke into laughter.

The moment came as a rare reprieve from an otherwise tense few hours of testimony from the special counsel as he recounted his report on Russian interference in the 2016 election.

Mueller repeatedly pointed back to the contents of his more than 400-page report when pressed by lawmakers on both sides of the aisle to clarify details on the origins of his report and its findings.

Mueller on Wednesday told Congress that he generally agreed that lies by Trump campaign officials and administration officials impeded his nearly two-year investigation. He also testified earlier that President TrumpDonald John TrumpLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Saudi Arabia paid 0 million for cost of US troops in area Parnas claims ex-Trump attorney visited him in jail, asked him to sacrifice himself for president MORE refused to sit down for an in-person interview during his investigation.

The former special counsel will also testify before the House Intelligence Committee on Wednesday.