Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE (D) expressed confidence in his campaign's strength and dismissed concerns over his fundraising pace in an interview aired on Sunday night.

In a "60 Minutes" interview with anchor Norah O'Donnell, Biden vowed to "flat [out] beat" both Sens. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.), who have vied for the mantle of runner-up in recent months while trailing Biden in most polling.

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"Let's talk about the state of the race because it has tightened. Do you still consider yourself the frontrunner?" asked O'Donnell.

"I know I'm the frontrunner," responded Biden. "Find me a national poll with a notable...a couple exceptions. But look, this is a marathon."

"You have less than $9 million in the bank," O'Donnell pressed the vice president, adding: "Bernie Sanders has 30...nearly $34 million in the bank. Senator Warren has $26 million. How do you compete against that?"

"I just flat [out] beat them," Biden said. "We're on a course to do extremely well. I’m not...I'm not worried about being able to fund this campaign. i really am not, truly."

Biden's fundraising declined by $7 million between the second and third-quarters of 2019, and in the most recent filing period trailed Sanders, Warren, and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D) in donations.

The former vice president has since shifted on his opposition to super PACs, and in a statement this week the Biden campaign indicated that he would accept aid from such organizations in a general election matchup against President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

“In this time of political crisis, it is not surprising that those who are dedicated to defeating Donald Trump are organizing in every way permitted by current law to bring an end to his disastrous presidency,” his deputy campaign canager Kate Bedingfield said. “Nothing changes unless we defeat Donald Trump.”