In a dramatic development, the case implicating former President Donald J. Trump and his associates in alleged efforts to undermine the 2020 election results in Georgia veered into personal territory on Thursday. The focus shifted to the romantic and financial aspects of the prosecutors' lives, including their living arrangements, vacations, and financial accounts, in an uncommon and fiercely contested hearing.

Attorneys representing Mr. Trump and his co-defendants contended that Fulton County District Attorney Fani T. Willis and the special prosecutor she appointed, Nathan J. Wade, should be disqualified due to conflicts of interest stemming from their romantic and financial connections. Ms. Willis and Mr. Wade vehemently refuted these allegations during Thursday's testimony, with Ms. Willis accusing the defense attorneys of disseminating falsehoods.

Addressing Ashleigh Merchant, counsel for Michael Roman, a former Trump campaign official also named in the case, Ms. Willis asserted, "You think I'm the one on trial. These individuals are being tried for attempting to manipulate the 2020 election. I'm not the one under scrutiny, no matter how strenuously you attempt to portray me as such."

The hearing, held in Fulton County Superior Court, marked a striking twist in the proceedings, as the prosecutors who have accused Mr. Trump of seeking to invalidate election outcomes faced probing questions from defense attorneys about their shared trips, personal relationships, and financial transactions.

Ms. Willis took the stand following testimony from her former friend, Robin Bryant-Yeartie, who claimed that Ms. Willis and Mr. Wade initiated a romantic involvement in 2019, prior to Ms. Willis appointing him in November 2021. According to Ms. Bryant-Yeartie, their relationship persisted until their falling out in 2022, just before their last interaction.

The timeline provided by Ms. Bryant-Yeartie could prove crucial for the defense's attempt to discredit the case against Mr. Trump and his co-defendants. Demonstrating that Ms. Willis and Mr. Wade's romantic connection predates his hiring would bolster the argument for their disqualification due to a potential conflict of interest.

The defense contends that Ms. Willis recruited Mr. Wade for mutual financial gain. Since his appointment, Mr. Wade has received over $650,000 in payment, and defense attorneys allege that he incurred substantial expenses on vacations with Ms. Willis, charging them to his credit cards. Ms. Willis maintains that she reimbursed him in cash for these trips.

Ms. Bryant-Yeartie expressed certainty about the timeline of the romantic relationship, citing instances of "hugging, kissing," and "affection" between Ms. Willis and Mr. Wade as early as 2019.