Arizona Republicans chose a new party chair on Saturday, a move that tightened the grip on the state party hierarchy by far-right supporters of former President Donald J. Trump and that came days after a scandal that forced the last chairman to resign.

Gina Swoboda, who directed election-day integrity operations in Arizona for Mr. Trump in 2020 and runs a nonprofit group that has falsely claimed to have found huge discrepancies in voting records in a number of states, was picked to replace Jeff DeWit, who stepped down as chairman on Wednesday.

Ms. Swoboda, whom Mr. Trump endorsed on Friday, won an overwhelming majority of votes in an election of state party officials held at the party’s required annual meeting in Phoenix. The vote was delayed by a lengthy debate over a motion to ban the use of electronic tabulators — mistrusted by many election deniers in the party — to count the ballots.

Kari Lake, a far-right candidate for U.S. Senate and close ally of Mr. Trump who had a central role in Mr. DeWit’s fall, took to the stage on Saturday to nominate Ms. Swoboda. But she was met with a din of boos and heckling from the crowd, an apparent rebuff to her involvement in the scandal.

Mr. DeWit resigned after a leaked voice recording surfaced on Tuesday in which he told Ms. Lake that “very powerful people” would give her money or a comfortable job if she would sit out the Senate contest. In the recording, Ms. Lake, who ran unsuccessfully for governor in 2022 and embraced Mr. Trump’s false claims about the 2020 election, was heard telling Mr. DeWit, “That’s immoral — I couldn’t look at myself in the mirror.”

Mr. DeWit claimed on Wednesday that Ms. Lake had released the recording of the conversation, which he said occurred at Ms. Lake’s house more than 10 months ago, and that it had been selectively edited. He added that he was resigning because Ms. Lake had threatened to release a second damaging recording if he did not resign.