San Francisco Fed President John C. Williams on Wednesday reiterated his support for ending a critical bond-buying program. In a May speech in Portland, Williams said the Fed could curtail the program as early as this summer. The bond-buying program was initiated last year to stimulate the economy. It buys $85 billion in bonds monthly. In a speech at the Embassy Suites Wednesday, Williams said he agrees with Fed Chairman Ben Bernanke’s timetable for reducing the program “later this year and ending…