Sanders Disappointed After Trump Pulls out of Debate

U.S. Democratic presidential candidate Bernie Sanders expressed disappointment on Friday after Republican presidential candidate Donald Trump said he would not debate Sanders ahead of California's June 7 primary.

"I heard that he was going to debate me, then I heard that he was not going to debate me, then I heard that he was going to debate me. Now you're telling me that he is not going to debate me. Well, you know, I hope that he changes his mind again," Sanders said in a video clip posted on an ABC News Twitter account.