Fulton County District Attorney Fani Willis took the witness stand Thursday and forcefully pushed back against what she described as “lies” about her romantic relationship with a special prosecutor during an extraordinary hearing over misconduct allegations that threaten to upend one of four criminal cases against Donald Trump.

A visibly upset Willis, who originally fought to stay off the witness stand, agreed to testify after a previous witness said her relationship with special prosecutor Nathan Wade began earlier than they had claimed. The district attorney’s testimony grew heated under questioning from a defense attorney who’s trying to remove Willis from Trump’s 2020 election interference case, with the prosecutor at one point raising papers in front of her and shouting: “It’s a lie!”

“Do you think I’m on trial? These people are on trial for trying to steal an election in 2020. I’m not on trial no matter how hard you try to put me on trial,” Willis told defense attorney Ashleigh Merchant. At another point, Willis said, “Merchant’s interests are contrary to democracy.”

Willis is expected to return to the witness stand on Friday to continue answer questions. The probing questions for Willis and for Wade, who testified before her, underscored the extent to which the prosecutors who pledged to hold Trump accountable are themselves now under a public microscope, with revelations about their personal lives diverting attention away from Trump’s own conduct and raising questions about the future of the case as Trump vies to reclaim the White House.

The revelation of Willis and Wade’s romantic relationship has provided an opening for Trump and his Republican allies to try to cast doubt on the legitimacy of Willis’ case, which the former president has characterized as politically motivated. Other Republicans have cited them in calling for investigations into Willis, a Democrat who’s up for re-election this year.