Rudy Giuliani is defending Donald TrumpDonald John TrumpOver 100 lawmakers consistently voted against chemical safeguards: study CNN's Anderson Cooper unloads on Trump Jr. for spreading 'idiotic' conspiracy theories about him Cohn: Jamie Dimon would be 'phenomenal' president MORE's remarks that President Obama created the Islamic State in Iraq and Syria (ISIS).

“I think what he’s saying, there is legitimate political commentary,” Giuliani, a Trump supporter, said Thursday on CNN’s “New Day.”

“It is true in the sense that before Obama, ISIS was an almost unknown, small little organization. He even called it the JV. Totally wrong.”

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Giuliani said Obama’s decision to withdraw troops from Iraq allowed ISIS to gain a foothold.

“Here’s why it happened: He withdrew the troops from Iraq,” said Giuliani. "General [David] Petraeus had secured the eastern part of Iraq."

“It wasn’t in turmoil, it wasn’t in revolution and it wasn’t breeding terrorists,” he continued. "He had gotten the support of the Sunni tribes.

“When we pulled out, and the Obama administration and our secretary of State were unable to get a security of forces agreement for our troops, that’s when ISIS formed. That’s what [Trump] means by it.”

Trump on Wednesday blamed Obama and Hillary ClintonHillary Diane Rodham ClintonTrump to declassify controversial text messages, documents related to Russia probe Hypocrisy in Kavanaugh case enough to set off alarms in DC Clinton: Hard to ignore 'racial subtext of virtually everything Trump says' MORE, his former secretary of State, for allowing ISIS to form.

“ISIS is honoring President Obama,” he said during a rally in Fort Lauderdale, Fla. "He is the founder of ISIS. He founded ISIS.

“I would say the co-founder would be crooked Hillary Clinton,” he added of the Democratic presidential nominee.

“We should never have gotten out the way we got out. We unleashed terrible fury all over the Middle East," said Trump.