Sen. Claire McCaskill (D-Mo.) on Sunday turned the tables on Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE in an attempt to disprove the Republican presidential nominee's claim that President Obama is the founder of the Islamic State in Iraq and Syria (ISIS).

ADVERTISEMENT

The Missouri senator said there are a lot of reasons that ISIS rose up, citing a status of forces agreement (SOFA) that President George W. Bush negotiated.

"We couldn't leave our troops in Iraq, even if the president wanted to, because the parliament in Iraq was refusing to give them immunity," McCaskill said on "Fox News Sunday."

"Now, Trump probably thinks the SOFA ... is a gilded couch at Mar-a-Lago. He probably doesn't even know what SOFA is, but that was a very relevant part of the this," she said.

"It was also important to realize that [Syrian President Bashar al] Assad, by what he did in his country, allowed ISIS to move into ... Syria and get strongholds and recruit. That was the work and support of [Russian President Vladimir] Putin, who is Trump's best buddy. So you can say Trump and his friend Putin are the founder of ISIS, which probably would be more accurate than calling out the commander in chief in that way."

“ISIS is honoring President Obama,” Trump said Wednesday during a rally in Fort Lauderdale, Fla. “He’s the founder of ISIS. ... He founded ISIS. “And I would say the co-founder would be Crooked Hillary Clinton,” Trump added of his Democratic rival and Obama’s former secretary of State. Trump later wrote off the comments as "sarcasm." "Ratings challenged @CNN reports so seriously that I call President Obama (and Clinton) 'the founder' of ISIS, & MVP," Trump tweeted. "THEY DON'T GET SARCASM?"

McCaskill said Sunday that Trump's comments related to ISIS are "disrespectful to the military that is out there fighting ISIS everyday."

"When they hear a presidential candidate try to act like that our president is on the bad guy's side," she said, "how do you think that makes them feel as they're out there in the field fighting?"