A federal judge in San Francisco says he wants to conduct a full trial on a lawsuit seeking to overturn California's same-sex marriage ban because he expects the case to one day reach the U.S. Supreme Court.

During his first hearing on the challenge to Proposition 8, U.S. District Chief Judge Vaughn Walker asked lawyers for both sides to identify the issues they agree on up front and those that would need to be resolved at trial.

Walker also rejected a request that he suspend enforcement of Proposition 8 while the case proceeds in court. But he says he wants to put it on an accelerated timetable because it involves such serious issues.

He told the lawyers to report back to him in writing by Aug. 7.