Hillary ClintonHillary Diane Rodham ClintonRonan Farrow exposes how the media protect the powerful Kamala Harris to Trump Jr.: 'You wouldn't know a joke if one raised you' Comey says he has a 'fantasy' about deleting his Twitter account after end of Trump term MORE's top campaign aide said on Sunday he expects the Democratic presidential front-runner to get the delegates needed to secure the Democratic nomination after Tuesday's primary contests.

"We think we're going to come out of Tuesday night with the delegates we need for her to be the first woman nominee on a major-party ticket in the United States," Clinton's campaign chairman, John Podesta, said on "Fox News Sunday."

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"So we're looking forward to that."

Several states, including delegate-rich California, will hold primaries on Tuesday. Both Clinton and rival Bernie SandersBernie SandersSanders on difference with Warren: she's a capitalist 'I'm not' Sunday Show Preview: Trump's allies and administration defend decision on Syria Klobuchar takes shots at health and education plans supported by Sanders and Warren MORE have been campaigning in the Golden State ahead of the primary.

Podesta touted Clinton's lead over Sanders, saying it is the Vermont senator's decision about whether or not to stay in the race until the Democratic National Convention in late July. But he emphasized that Clinton will have the delegates necessary to be the Democratic nominee.

He said Clinton's campaign will do everything it can to reach out and appeal to Sanders supporters.

"We want to bring this party together, because the country faces a major threat in [presumptive GOP presidential nominee] Donald TrumpDonald John TrumpGiuliani says he is unaware of reported federal investigation Louisiana's Democratic governor forced into runoff Lawmakers focus their ire on NBA, not China MORE," Podesta said.

"And we hope that he will join us. He's been out there saying that he wants to work seven days a week to stop Donald Trump, and we hope that starting as soon as possible, that he will go ahead and fulfill that commitment and work with us."

Podesta also said the general election is "just coming into focus," brushing off poll numbers that show the race between Trump and Clinton tightening.

"He has consolidated Republicans and that's led to something of a tightening of the polls," he said.

"But this has really just begun."