The pollster for President Trump's campaign says that he believes Sen. Bernie Sanders (I-Vt.) would have defeated Trump in the general election had he secured the Democratic nomination.

Tony Fabrizio said at a Harvard University Institute of Politics event Monday that Sanders could have prevailed where Democratic presidential nominee Hillary Clinton did not.

"There's no question that if it had been anybody other than Clinton or anybody other than Trump, that race would not have been as close as it was either way," Fabrizio said. "It would not have been."

When asked what would happen during a Sanders-Trump match-up, Fabrizio replied, "I think Sanders beats Trump."

"I think Sanders would have had the ability to reach a lot of the less than college-educated, low-income white voters," he added.

Some Democrats criticized the Vermont senator for staying in the race too long, saying he damaged Clinton's campaign. Polls, however, consistently showed the self-described democratic socialist beating Trump in a head-to-head match-up.