Democratic presidential candidate Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE said on Sunday that he thinks he is the strongest candidate to take on the Republicans, adding rival Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE is getting "very nervous."

"I think the secretary is getting very nervous, that poll after poll shows us doing much better against [GOP presidential front-runner Donald] Trump than she is," the Vermont senator said on ABC's "This Week."

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"The last CNN poll had us up by 20 points. Here in Wisconsin, I was 19 points ahead of Trump, also a significant margin better than she is."

Sanders said the fact that he's the longest-serving independent in the history of the country makes his candidacy even stronger.

"You've got a lot of independents out there," he said.

Sanders said he thinks he can get "virtually all of the Democratic vote" and a lot of the independent vote in the general election.

"I think we've got a lot of young people's vote, working-class people's vote. I think we're on the way to a victory if we can win the Democratic nomination," he said.

Sanders added that he's won states over the last few weeks by large margins and is the candidate in the best position to win in a general election.

"I think as many superdelegates look out there, what they are saying, 'Yes, well, I like Hillary, I like Bernie, but most importantly, we've got to beat Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE, and I think they will see that Bernie Sanders is the strongest candidate to do that,' " he said.