's campaign manager insisted Tuesday that the Vermont senator will win the Democratic nomination overat the party's convention this summer.

"I think what this campaign is looking for and what the senator is looking for is going into the convention and coming out with the nomination," Jeff Weaver said on CNN's " New Day ."

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"When we arrive at the convention, it will be an open convention, likely with neither candidate having a majority of pledged delegates," Weaver told host Chris Cuomo.

Clinton campaign manager Robby Mook said in a memo published Monday evening that Clinton has built a "nearly insurmountable lead" among delegates and "the Sanders campaign's path forward relies on overturning the will of the voters."

Clinton has 1,712 of the needed 2,383 delegates to lock up the nomination, according to The Associated Press's delegate tracker . That total is made up of 1,243 pledged delegates and 469 superdelegates, who are free to switch to Sanders if they choose.

Sanders has 1,011 delegates, consisting of 980 pledged delegates and 31 superdelegates. Mook argued that "it’s becoming increasingly unlikely that Senator Sanders will be able to catch up," noting he'd need about 60 percent of the vote in large-delegate states like New York, Pennsylvania, California and New Jersey.

Sanders is aiming to keep up momentum by pulling out a win in Wisconsin on Tuesday, as Clinton looks to defend turf in New York ahead of that state's primary April 19.