Joe Biden 'confident' Hillary Clinton will win nomination and presidency

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Vice President Joe Biden all but formally endorsed Democratic presidential frontrunner Hillary Clinton in a new interview, telling ABC News he was "confident" the former secretary of state would win the Democratic nod and the presidency.

"I feel confident that Hillary will be the nominee, and I feel confident that she'll be the next president," Biden told ABC's Robin Roberts in the interview, which will air on Wednesday's episode of Good Morning America.

Click through images of Hillary Clinton's potential running mates:

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Hillary Clinton potential running mates, VPs
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Joe Biden 'confident' Hillary Clinton will win nomination and presidency

Tim Kaine

The junior Democratic Senator from the swing state of Virginia could be a strategic selection for Hillary. Kaine also served as the governor of Virginia from 2006- 2010.

(Photo by Samuel Corum/Anadolu Agency/Getty Images)

Elizabeth Warren

The current U.S. Senator from Massachusetts is popular among progressive Democrats, and some even tried to draft her to run for president herself in 2016. 

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Sherrod Brown

Insiders believe that the senior U.S. Senator from Ohio could help Clinton increase her popularity with working-class voters, a group she has yet to win in a big way so far in primary contests.  

(Photo By Bill Clark/CQ Roll Call)

Cory Booker

The U.S. Senator from New Jersey is both youthful and charismatic and would add racial diversity to a Clinton ticket. 

(Photo by KK Ottesen for The Washington Post via Getty Images)

Tom Perez

The current U.S. Secretary of Labor is considered a sleeper pick by many Democrats because he is not well known outside of D.C., but some believe his strength and popularity among union workers and other progressive groups could be an asset to Clinton's ticket. 

(Photo By Tom Williams/CQ Roll Call)

Julian Castro

The former mayor of San Antonio and current U.S. Secretary of Housing and Urban Development has been rumored as a possible running mate for Clinton for months, but in May he said in an interview that the Clinton campaign hasn't talked to him about the role.

(AP Photo/Eric Gay)

Amy Klobuchar

Insiders confirmed that Clinton is definitely considering a woman as her vice presidential pick, and as U.S. Senator from Minnesota, Klobuchar has a seat Democrats would likely maintain. She's also been described as "by far" the most popular politician in her state. 

 (AP Photo/Ann Heisenfelt)

Bernie Sanders

The Independent from Vermont has become Hillary Clinton's primary rival for the Democratic nomination, garnering a surprising amount of support. Bringing Sanders onto the ticket could help to unite both sets of supporters who have been split in Democratic primaries.

(Photo by Ralph Freso/Getty Images)

Martin O'Malley

A former 2016 rival of Hillary Clinton, and former Maryland governor, Martin O’Malley could help bring some executive experience, along with a slight youthful boost to the ticket.

(Photo by Joe Raedle/Getty Images)

Tom Vilsack

The Secretary of Agriculture since 2009, Tom Vilsack also served as the governor of Iowa from 1999 to 2007. Vilsack could bring some governing experience along with swing state influence.  

(BELGIUM - Tags: AGRICULTURE POLITICS BUSINESS)

Colorado Gov. John Hickenlooper delivers his annual State of the State address to lawmakers and guests, inside the state legislature, in Denver, Thursday, Jan. 14, 2016. Hickenlooper called upon Republicans and Democrats to return to an era of civility and compromise in his address to the Republican-controlled Senate and the Democrat-led House. (AP Photo/Brennan Linsley)

Evan Bayh 

Evan Bayh could bring a more right leaning brand of politics to the ticket. Bayh previously served as the junior U.S. Senator from Indiana from 1999 to 2011, and also as the 46th Governor of Indiana from 1989 to 1997.  

Joe Biden

While the likelihood of him agreeing to take on the veep job again might be low, Biden's popularity among Democrats would likely boost Clinton's chances. 

(Photo credit MANDEL NGAN/AFP/Getty Images)

Bill Clinton

Hillary's husband is technically allowed to serve in the job, and some legal experts even think he'd be able to take office if necessary. Unfortunately for the diehard Clinton supporters, a Clinton-Clinton ticket will probably be a dream that never comes true. 

(Photo By Bill Clark/CQ Roll Call)

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The comments come one month after Biden told Mic that he "would like to see a woman elected president," but stopped short of either endorsing Clinton or assessing her chances against rival Bernie Sanders. Since then, Clinton has cemented her frontrunner status with victories in the New York primary on April 19 and in the so-called "Acela Primary" on April 26.

Read more: Joe Biden: "I Would Like to See a Woman Elected"

The vice president cast an early ballot ahead of the April 26 primary in his home state of Delaware, but did not disclose for whom he voted.

Though Biden served alongside Clinton in the Obama administration, there have been moments of tension between his orbit and hers — both during and since his own contemplation of a 2016 presidential bid. In public remarks, Biden has implicitly jabbed at Clinton's partisanship and her credibility on issues of economic inequality, while lauding Sanders' authenticity on those issues.

Still, while President Barack Obama has not offered an endorsement in the Clinton-Sanders race, it's an open secret that the White House hopes to see Clinton take the Oath of Office on Jan. 20, 2017. Echoing Clinton's talking points, Obama has suggested that Sanders is too much of a single-issue candidate, while the White House took Clinton's side in April, when Sanders suggested that her track record on issues like Wall Street and the Iraq War disqualified her from the presidency.

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