WASHINGTON – Joe Biden’s campaign said Monday that the former vice president would commit to participating in three debates, and slammed a push by President Trump’s advisers for additional debates as an “effort to change the subject.”“Our position is straightforward and clear: Joe Biden will accept the Commission’s debates, on the Commission’s dates, under the Commission’s established format and the Commission’s independent choice of moderators,” said Biden Campaign Manager Jen O’Malley Dillon in a letter to the Commission on Presidential Debates, the nonprofit group that sponsors general election debates, which was obtained by The Associated Press. “Donald Trump and Mike Pence should do the same.”“Any ‘debate proposals’ in lieu of that are.