Sen. John McCain (R-Ariz.) had some fiery words to say about Sen. Rand Paul (R-Ky.) this week regarding Paul’s stance on arming Syrian rebels.

Earlier this week, he asked Sean Hannity, “Has Rand Paul ever been to Syria? Has he ever met with ISIS?”

Tonight, Paul responded to McCain’s remarks on “Hannity,” saying that he believes that they “have a true policy difference here.”

McCain: Rand Paul 'Doing Somersaults As Beheadings Took Place’

"I’m not for arming radical jihadists, I’m not for arming radical Islam.  And I think most of the weapons – either intentionally or unintentionally – that have been given to the Syrian rebels, have basically just gone on through to ISIS.  If you give them to the moderate rebels – the so-called moderate rebels – that’s just a stopping point because ISIS takes them away,” Paul said.

He added that the U.S. doesn't even know who the head of the Free Syrian Army is.

Paul also discussed the Senate hearing today on ISIS, where he took on Secretary of State John Kerry over the constitutionality of President Barack Obama’s actions.

McCain: ‘Has Rand Paul Ever Been to Syria?’

“I think no intellectually honest person will say that when we voted in 2001 […] that has anything remotely to do with today.  I’m in support of going after ISIS.  I think they threaten our consulate, I think they threaten our embassy, and they threaten American interests. But I’m for doing it legally and constitutionally, and I think he’s dreaming if he thinks the 2001 vote on Afghanistan has anything to do with what we’re doing now."

Watch more above.