“Well, I’ve been very touched by Donald Trump’s love for me. But John, you know, with all due respect, I think there may be some aspect of this which he thinks will advantage himself,” he told host John Dickerson on CBS News’s “Face the Nation” in an interview to air Sunday.

On Thursday, Trump gave “Jimmy Kimmel Live” host Jimmy Kimmel a question to ask Sanders during his appearance on the show. He asked if Sanders would launch a third-party campaign because “both primary systems are rigged, but in particular the Democrats’ ridiculous system of superdelegates.”

“I wouldn’t use the word ‘rigged,’ because we knew what the rules were,” Sanders said on “Face the Nation.” “But what is really dumb is that you have closed primaries, like in New York State, where 3 million people who were Democrats or Republicans could not participate. Where you have a situation where over 400 super delegates came on board Clinton’s campaign before anybody else was in the race, eight months before the first vote was cast. That’s not rigged. I think it’s just a dumb process which has certainly disadvantaged our campaign.”