Sanders made the comments to New York Times columnist Ezra Klein Tuesday, after Trump aides announced the former president would soon return to social media with his own platform.

“Look, you have a racist, sexist, xenophobe, pathological liar, an authoritarian, somebody who doesn’t believe in the rule of law. This is a bad news guy,” Sanders said. “But if you’re asking me do I feel particularly comfortable that the then-president of the United States could not express his views on Twitter? I don’t feel comfortable about that.”

Sanders said Twitter should not be used “for authoritarian purposes and insurrection,” but added, “tomorrow it could be somebody else [getting banned] who has a very different point of view.”