The crowded hearing room in which former special counsel Robert MuellerRobert (Bob) Swan MuellerFox's Cavuto roasts Trump over criticism of network Mueller report fades from political conversation Trump calls for probe of Obama book deal 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 GarciaAudience laughs when Mueller jokes about member of Congress lying Here are the 95 Democrats who voted to support impeachment Top Dem money man puts muscle behind Latino mobilization 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 TrumpJimmy Carter: 'I hope there's an age limit' on presidency White House fires DHS general counsel: report Trump to cap California trip with visit to the border 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.