Bernie SandersBernard (Bernie) SandersDe Blasio headed to Iowa to speak at political fundraiser Yes, spills happen — but pipelines are still the safest way to move oil Why sexual harassment discussions include lawmakers talking about Bill Clinton’s past MORE late Wednesday told a crowd in Philadelphia that Democratic presidential rival Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE is not “qualified” for the White House.

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“She has been saying lately that she thinks I am quote, unquote ‘not qualified’ to be president,” Sanders said at Temple University. “I don’t believe that she is qualified ... if she is, through, her super-PAC, taking tens of millions of dollars in special interests funds.”

"I don't think that you are 'qualified' if you get $15 million from Wall Street through your super-PAC. I don't think you are 'qualified' if you have voted for the disastrous war in Iraq. I don't think you are 'qualified' if you have supported virtually every disastrous trade agreement," the Vermont senator added.

Clinton's campaign denies that the former secretary of State called Sanders "unqualified" for the presidency. She dodged several times during a Wednesday interview on MSNBC when asked if she thought Sanders was qualified for the presidency.

Instead, she pointed to Sanders's remarks in a New York Daily News interview, saying it "raised a lot of really serious questions" about the independent senator's qualifications on several issues, namely going after "big banks."  "I think he hadn't done his homework," she said.

The remarks highlight escalating rhetoric between the two Democratic hopefuls as Clinton looks to defend turf in New York ahead of the state's April 19 primary, while Sanders hopes to keep up momentum following wins in several recent states, including most recently Wisconsin.

Clinton has been hitting Sanders on his Democratic credentials, saying in a Politico podcast released Wednesday that she’s “not even sure” Sanders is a Democrat. She later said during a television appearance that he "himself doesn't consider himself to be a Democrat."

Sanders said late Wednesday that "Secretary Clinton appears to be getting a little nervous" amid his riff claiming Clinton is not qualified for the White House, prompting backlash from her campaign:

—This report was updated at 7:21 a.m.