"We have nothing polite to say right now," the Sanders adviser said, CNN's Jeff Zeleny reported.

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"The truth is, if you look at Donald Trump's record, what you find is this guy is a pathological liar," Sanders said while stumping for Clinton in September. "I'm not talking about a little lie there, or stretching the truth here. I am talking about him coming up with things in his head that do not exist. There are psychological definitions there."

"It is trying to divide this country up," he said. "It is telling us that we are supposed to hate Muslims, we are supposed to hate Mexicans, if we are men we are supposed to hate women, we are supposed to hate anyone who is different than we are."

Just before the election, a tweet from Sanders read, "I hope we defeat Donald Trump and we defeat him badly."

I hope today we defeat Donald Trump and we defeat him badly. https://t.co/8ttsSwcsnl pic.twitter.com/4Q1JDdglhV — Bernie Sanders (@BernieSanders) November 8, 2016