"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. So, we're looking forward to that," John Podesta, chairman of the Hillary Clinton Campaign, told Fox News.
Presidential primaries are scheduled to be held in six states, including the delegate-rich state of California (475) on Tuesday.
Clinton currently is 60 delegates short of the magical figure of 2,382 delegates needed to clinch the Democratic party's nomination.
The 68-year-old former secretary of state is receiving a tough fight from Vermont Senator Bernie Sanders, who has 1,547 delegates against Clinton's 2,323, as per the latest count of RealClearPolitics.Com.
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"What we're saying is that she will have the delegates to be the nominee. We're going to do everything we can to reach out to appeal to his supporters, to appeal to his (Sanders) campaign and to him directly. We want to bring this party together because the country faces a major threat in Donald Trump. We hope that he will join us," Podesta said.
"He (Trump) has consolidated the Republicans. That's led to something of a tightening of a pulse. But this has really just begun. That's why Hillary Clinton on Thursday of this week went to San Diego and really laid out a strong case about why he's unfit, why he does not meet the commander-in-chief test," he said.
"And what did she use to prove that point? Really his own words, the things he said in this campaign from being in favour of expanding and proliferating weapons of mass destruction and nuclear weapons to pulling out of NATO to offending our allies and supporting dictators around the world," Podesta said.
"The card we're going to play against Trump is that he has always been for himself. He's a self-aggrandizer at the expense of literally thousands of people," the top Clinton aide said.