Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE on Thursday attacked a Democratic lawmaker who said that the president’s longtime confidant may have made false statements during his congressional testimony, calling Rep. Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.) a "con man" and "full of schiff."

Stone delivered an impassioned speech to a crowd of roughly three dozen attendees at the conservative American Priority conference in Washington, D.C., days after he exercised his Fifth Amendment rights to reject a Democratic request for further congressional testimony.

He used the opportunity to not only repeatedly praise the president, but respond to Democrats who said that the former one-time Trump campaign adviser may have lied when he previously testified before Congress.

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Schiff, the ranking member of the House Intelligence Committee who is expected to be the panel's chairman in the coming year, told ABC on Sunday that publicly released emails between Stone and special counsel witness Jerome Corsi don't match up with Stone's congressional testimony.

Stone's 2017 testimony before the committee "needs to be provided to the special counsel for consideration of whether perjury charges are warranted," Schiff said during the interview.

Stone hit back on Thursday, calling Schiff a “con man."

“The congressman is full of schiff,” Stone said, in reference to a vulgarity, earning a smattering of laughs.

Stone, who has come under increasing scrutiny from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, made the public appearance just days after he rejected a request for documents and an interview from Democrats on the Senate Judiciary Committee. He asserted his Fifth Amendment rights for the denial.

After his remarks, Stone told reporters that he may reconsider his decision to exercise his Fifth Amendment rights if the Senate panel allows him to testify in public, claiming that his past "testimony has already been mischaracterized."

Stone maintained that he was being truthful when he testified before the House panel, claiming that he "could prove if forced to that everything I said in my submitted statement and in my questions was truthful."

While the ballroom was set up to seat hundreds of people, the few dozen in attendance were enthusiastic during Stone's keynote, often cheering him on as he delivered his remarks.

Stone also dismissed claims that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s tweet thanking Stone for having “guts” for saying he wouldn't testify against the president could be considered witness tampering.

Stone had told ABC’s George Stephanopoulos on Sunday that there is “no circumstance” under which he would testify against the president because he would “have to bear false witness against him."

Trump in turn had praised Stone for the remarks, tweeting on Monday that it’s “nice to know that some people still have ‘guts.’”

Some, including White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE's husband George Conway, had responded to the tweet by saying it could be considered witness tampering in Mueller's investigation.

But Stone rejected those statements, saying he was "proud" of the tweet and claiming that only left-leaning figures had made the assertions.