SAN FRANCISCO — Northern District Chief Judge James Ware made his debut in the Proposition 8 case today, asking tough questions of the gay-marriage foes who are seeking to undo the rulings by the gay judge who presided over the trial.

After an hours-long hearing, Ware said he planned to rule within 24 hours on whether ex-District Judge Vaughn Walker had a duty to disqualify himself from the case because he is in a long-term relationship with a man. He could have had an interest in marrying, proponents argue.