Trump, if he answers the MSM’s gotcha question at all, should say “It was Hillary’s campaign that raised doubts about his birth certificate. Are you saying that she lied?” and leave it at that.
Yes, leave it at that in bold. Obama is running for nothing, this is a distraction designed to stop his recent momentum. Get the EMails and health out of the news, talk about Obama's birth. Emphasizing that Hillary started it is counterproductive. No one cares, and it gets the issues that favor trump off the news.