Lawmakers who sit on the panel said they are prepared to pursue criminal charges against witnesses like Stephen K. Bannon who have balked at cooperating. And the committee may issue a subpoena as early as Wednesday to Jeffrey Clark, a Trump Justice Department official who sought to deploy department resources to support former president Donald Trump’s false claims of massive voting fraud in the 2020 election.

“We are completely of one mind that if people refuse to respond to questions without justification that we will hold them in criminal contempt and refer them to the Justice Department,” Rep. Adam B. Schiff (D-Calif.), a member of the panel, said in an interview Tuesday…

Clark is considered a key witness for the panel, which is looking into Trump administration efforts to overturn election results and interfere with the peaceful transfer of power.

Clark, the former acting head of the DOJ’s civil division, emerged as a key player in Trump’s push to amplify his voter-fraud claims after it was reported that the two men were in close touch in the days leading up to the Jan. 6 attack, which was the most serious attack on the Capitol since the War of 1812.