Rangel, who introduced Clinton at a campaign event Sunday in his home state of New York, also weighed in on video of Sanders supporters throwing a thousand $1 bills at Clinton's motorcade over the weekend as she arrived at actor George Clooney's house in Los Angeles for a high-dollar fundraising event.

"Isn't that stupid?" Rangel asked. "I think it's stupid. I think that they have money to throw away, literally, and that it's not changing anything."

Rangel then suggested that Sanders, a self-described democratic socialist, "collect that money" to support efforts to elect Democrats.

"Maybe if he tried to get some Democrats — instead of socialist Democrats — elected, maybe it would help him and the country and the Democratic Party," Rangel said.