Trump Backs Out of 'Easy Payday' Bernie Debate

Bernie also tweeted, "If you want a campaign that can defeat Trump and defeat him badly, we are that campaign."

With a mathematical impossibility of overtaking Hillary Clinton in the delegate count in the final states, Sanders is hoping to switch the loyalty of superdelegates to put him over the top at the convention in Philadelphia.

Sanders' campaign manager, Jeff Weaver, said in a statement earlier today that their campaign and Trump's campaign had received two offers by broadcast television networks to host the debate, and "both offers include a major contribution to charity."

“We are prepared to accept one of those offers and look forward to working with the Trump campaign to develop a time, place and format that is mutually agreeable. Given that the California primary is on June 7, it is imperative that this all comes together as soon as possible," Weaver said. "We look forward to a substantive debate that will contrast the very different visions that Sen. Sanders and Mr. Trump have for the future of our country.”