White House hopeful 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 doubled down on his vow to cooperate with Republicans should he be elected president, saying he successfully worked across the aisle as vice president.

“There’s an awful lot of really good Republicans out there,” he said Saturday at a Massachusetts fundraiser. “I get in trouble for saying that with Democrats, but the truth of the matter is, every time we ever got in trouble with our administration, remember who got sent up to Capitol Hill to fix it? Me. Because they know I respect the other team.”

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Biden added that many conservatives are being “intimidated” to follow in lockstep with 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.

“They’re decent people. They ran because they care about things, but they’re intimidated right now,” he told the fundraiser’s attendees.

Similar comments have in the past infuriated progressive activists, who are in search for a candidate who can effectively fight against Trump and the GOP’s agenda and argue that the former vice president is naïve to suggest Republicans on Capitol Hill are interested in bipartisanship.

But, Biden, who leveraged his decades serving in the Senate to help become one of the Obama administration’s chief negotiators on Capitol Hill, has maintained that reaching across the aisle is the only way to implement long-lasting change.

“If you start off with the notion there's nothing you can do, well why don't you all go home then, man? Or let's start a real physical revolution if you're talking about it. Because we have to be able to change what we're doing within our system,” Biden said in June.

“You have to go out and beat these folks if they don't agree with you, by making your case - and that's what presidents are supposed to do: Persuade the public. Move people as to what's going on.”

Despite liberal pushback toward his bipartisan strategy, Biden has maintained his leads in most national and statewide primary polls ahead of several other frontrunners, including 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.), 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.) and Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.), all of whom are seeking to angle their campaigns’ appeal to the Democrats’ progressive flank.

--This report was updated on Aug. 18 at 7:48 a.m.