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Donald Trump is accusing Bernie Sanders of sending protesters to disrupt his campaign rallies.

In an interview on Fox News Sunday, Trump said he saw attendees come in "with the Bernie Sanders signs, right out of his printing press.” 

Sanders has dismissed the claims, saying that Trump "tells the truth very, very rarely," and "on this occasion, he's lying again."

The Vermont senator's campaign today retweeted the following clip from an interview:

But the GOP front-runner fired back on Twitter on Sunday, seeming to warn the Democratic candidate that his supporters could start showing up at his events, too.

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