During an interview right after CNN's Democratic presidential debate Thursday night, the Vermont senator noted that Clinton’s tone was different than in previous debates because the momentum is on his side.

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"I think the tone is different because we’ve won seven of the last eight state contests, and I think the Clinton campaign and the secretary are getting a little bit nervous," Sanders said.

"I think it’s undeniable that we have the momentum, and we’ve been attacked a whole lot by the Clinton camp, but I feel very very good coming into the New York primary on Tuesday.”

Sanders and Clinton sparred over a number of issues Thursday night after Sanders came out swinging moments into the debate, questioning the former secretary of State's judgment to be president.

But he went on to note that regardless of the shift in tone or who wins the Democratic nomination, the party will be unified in the November general election.

"I think there are no Democrats that I know or virtually none who will desert the Democratic Party" no matter who wins the nomination, Sanders said after the debate.

Despite Sanders's recent victories, he has not made much of a dent in Clinton’s delegate lead and can’t afford a loss in New York’s delegate-rich primary next Tuesday.

Sanders and Clinton both have ties to the Empire State: he grew up in Brooklyn and she served as U.S. senator there.

Polls show Clinton with a double-digit lead heading into the primary.