A Georgia judge ruled that prosecutor Fani Willis can continue her election-interference case against Trump as long as the deputy with whom she had a romantic relationship steps aside, prompting his swift resignation.

ATLANTA—A Georgia judge ruled that Fani Willis, the prosecutor here who indicted Donald Trump on election-interference-related charges, can continue her case so long as the deputy with whom she had a romantic relationship steps aside, prompting his swift resignation.

The now-ended relationship between Willis and Nathan Wade, her chief legal adviser, created an “appearance of impropriety,” Fulton County Superior Court Judge Scott McAfee wrote in a filing. Willis’s office has paid him hundreds of thousands of dollars for legal services since 2021.