During heated testimony at Rudy Giuliani’s ethics hearing Monday, the attorney for ex-President Donald Trump insisted there was evidence of widespread voter fraud during the 2020 election, adding he was duty-bound to make certain arguments in court.

Giuliani, who is accused of promoting baseless voter fraud claims in Pennsylvania federal court in violation of attorney ethics rules, doubled down on his familiar claims of fraud during the first day of the hearing, which turned combative at times as the former New York City mayor failed to concisely answer some lines of questioning.