Sen. Lindsey Graham (R-SC) went off on Donald Trump on "America's Newsroom" this morning, calling him "clueless" and "uninformed" on foreign policy. 

Graham also said Trump "melted down" with a new attack on Ben Carson, believing that this is a "turning point" in the race.

In a 90-minute speech in Iowa, Trump told supporters that Carson has admitted having "pathological" issues, bringing up child molesters in the attack on his Republican rival.

"I'm not saying it. He actually said 'pathological temper,' and then he defined it as disease. ... If you're pathological, there's no cure for that, folks. If you're a child molester, a sick puppy, there's no cure for that," said Trump. 

Trump then defended his foreign policy positions, declaring that he will "bomb the s***" out of ISIS oil installations if he's elected. 

He then went after GOP "tough guys" for wanting to send U.S. troops into Syria and for opposing Russia's attacks on ISIS in Syria.

Graham responded by saying Trump "has no clue of what he's talking about."

"Dr. Carson found redemption in the Lord. He's a good and decent man. Donald Trump is the most uninformed person I've ever met running for president when it comes to foreign policy," said Graham, adding that Trump's views are "even more naive than Barack Obama."

When it comes to going after ISIS oil, Graham said he does not support destroying infrastructure in Iraq and Syria. 

"You're not gonna destroy ISIL by killing one person. You're not gonna destroy them by blowing up an oil field. The only way you're gonna destroy them is go in on the ground with a regional army," said Graham, adding that a deal with Russia would be the "dumbest thing" the United States could do.

He said oil revenue is only about 20 percent of what ISIS brings in, so that will not "destroy" the terror group. 

Watch Graham's take and Trump's comments below.

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