"I hesitate to say this because I really don't like to disparage public officials, but Donald Trump is a pathological liar," Sanders said during a televised event on Sunday night.
In the past few days, Trump’s campaign rallies have several times been disrupted by protesters. In Chicago, a brawl between thousands of Trump’s supporters and opponents led to its cancellation.
Most recently, a man rushed the stage at a campaign event in Ohio on Saturday, which prompted Secret Service personnel to briefly take the businessman in a ring. The assailant was later identified as a Sanders supporter.
"Our campaign does not believe and never will encourage anybody to disrupt anything," Sanders argued, according to Sputnik News.
He said millions of people had been voting for him, which did not mean he should take responsibility for each one of them.
Sanders was speaking at the Democratic town hall at Ohio State University in Columbus ahead of Tuesday’s primaries.