Biden spills beans: Sanders will endorse Clinton
© Greg Nash

Vice President Biden says Bernie SandersBernie SandersSenators say White House aides agreed to infrastructure 'framework' Briahna Joy Gray: Biden is keeping the filibuster to have 'a Joe Manchin presidency' On The Money: Biden to fire FHFA director after Supreme Court removes restriction | Yellen pleads with Congress to raise debt ceiling MORE will endorse his Democratic primary opponent, Hillary ClintonHillary Diane Rodham ClintonCommunion vote puts spotlight on Hispanic Catholics Trump's biggest political obstacle is Trump The Memo: Some Democrats worry rising crime will cost them MORE.

"I've talked to Bernie, Bernie's going to endorse her, this is going to work out," Biden said in an interview with NPR's "Weekend Edition" to air Sunday. "The Democrats are coalescing even before this occurs."

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Michael Briggs, a Sanders spokesman, would not confirm or deny the vice president's assertion.

“We are in the process of talking” with the Clinton campaign, he said, and noted that the candidates met earlier this month to talk about next steps. 

Sanders has been withholding his endorsement for weeks since primary season ended on June 14. 

Clinton is seen as the party's likely nominee, having secured enough delegates to win the party's nomination at the July convention. 

While Sanders has repeatedly promised he’ll do what he can to stop presumptive GOP nominee Donald TrumpDonald TrumpIran claims U.S. to lift all oil sanctions but State Department says 'nothing is agreed' Ivanka Trump, Kushner distance themselves from Trump claims on election: CNN Overnight Defense: Joint Chiefs chairman clashes with GOP on critical race theory | House bill introduced to overhaul military justice system as sexual assault reform builds momentum MORE from winning the White House, he's turned down numerous chances to endorse Clinton and has instead shifted his campaign's focus toward winning policy and platform concessions at the convention. 

It's not the first time that Biden, who will campaign with Clinton next week in Pennsylvania, got out ahead of the news cycle. His surprise endorsement of same-sex marriage, before President Obama came out in support of the policy, prompted Obama to announce his support soon after. 

Biden will hit the campaign trail with Clinton next Friday in Scranton, Pa. He told NPR that vouching for Clinton to voters back home is the best way to support her. 

"I understand the hardest thing to do is not writing the check. The hardest thing is vouching. When you vouch for them you say, 'I'm putting my reputation on the line, I believe this person is a good person, has character," Biden said. "You're putting your rep on the line. You're saying, 'I think this person has character,' and that's what I'm prepared to do for Hillary."

In an interview on MSNBC later Thursday evening, Sanders wouldn't confirm or deny Biden's claim. He said he's hopeful he'll be able to give an endorsement but that "we're not there quite yet." 

Updated at 9:20 p.m.