Rudy Giuliani on Wednesday slammed Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonThe Hill's Campaign Report: Biden, Harris make first public appearance as running mates Trump campaign spox rips GOP congressman over rejection of QAnon conspiracy Biden hits back after Trump's attacks on Harris MORE, saying she helped to create the Islamic State of Iraq and Syria (ISIS).

"I mean, Hillary Clinton could be considered a founding member of ISIS," the former mayor of New York City told Bill O'Reilly on Fox News on Wednesday night.

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Giuliani said Clinton had her chance to do something about the terror group when she was secretary of State, but said she helped to create ISIS by "being part of an administration that withdrew from Iraq."

"By being part of an administration that let [former Iranian Prime Minister Nouri al-Maliki] run Iraq ... into the ground, so you forced the Shiites to make a choice, by not intervening in Syria in the proper time."

Bill O'Reilly countered, saying Clinton couldn't force President Obama to do anything. He added the only thing she could have done was resign.

"Yeah," Giuliani replied. "Which is what a patriot does."

Giuliani continued to hit the Democratic front-runner later in the interview, saying he doesn't want to see her in the White House.

"She's had her chance," he said. "She's running on he record as secretary of State. What was her record as secretary of State? An utter failure."

He said he hasn't made his final decision as far as an endorsement of a presidential candidate, but right now, Republican presidential front-runner Donald TrumpDonald John TrumpNew Bob Woodward book will include details of 25 personal letters between Trump and Kim Jong Un On The Money: Pelosi, Mnuchin talk but make no progress on ending stalemate | Trump grabs 'third rail' of politics with payroll tax pause | Trump uses racist tropes to pitch fair housing repeal to 'suburban housewife' Biden commemorates anniversary of Charlottesville 'Unite the Right' rally: 'We are in a battle for the soul of our nation' MORE "looks like the best one."

"I haven't made my final decision," he said.