Trump is only doing this to suck up media coverage and move away from the planted Vince Foster smear. Hes not going to debate Bernie Sanders the socialist.
Yes, he is a fraud and a coward who knows that it's easier to lie about raising money than to actually have a debate.
He's won his party nomination why debate someone whos stuck in 2nd place and soon to be out of the race?
Its smart of him to soak up media attention ( hes once again drowning out the other candidates)floating this ideal. Besides Bernie is low on cash right now so of course he wants the debate.