A Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE surrogate said scant foreign policy experience leaves Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) unfit for the vice presidency.

“I know Secretary Clinton very well,” former Gov. Ed Rendell (D-Pa.) said on 1210 WHPT Radio in Philadelphia, as first reported by BuzzFeed. "I’m not an insider in the campaign, but I know her pretty well. I think she will not pick somebody who she feels in her heart is not ready to be president or commander-in-chief.

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“I think Elizabeth Warren is a wonderful, bright, passionate person but with no experience in foreign affairs and not in any way, shape or form ready to be commander-in-chief.”

Rendell pointed out that Warren started her Senate career just two years ago.

“I don’t know who Secretary Clinton will pick, but it will be somebody who if something happens to her her first week in office, that person could step in and be president the next day," Rendell said.

BuzzFeed on Wednesday said Rendell eventually called WHPT Radio back to say Warren’s pitfalls are also his own.

“I don’t want to leave it out there about Elizabeth Warren,” he said. "Elizabeth Warren’s problem would be the same problem I’d have.

“Let’s assume someone said consider Gov. Rendell for vice president. I have no experience militarily, no experience in foreign affairs and would be a difficult choice because if anything happened in week one and I became president, I would be lost.”

Reports emerged Wednesday that Warren is not currently interested in becoming Clinton’s running mate but has not ruled it out.

Warren also purportedly plans on endorsing Clinton, the presumptive Democratic presidential nominee, within a few weeks.