The tensions between the two men seemed to recede in recent days with Trump’s announcement that he would slap Turkey with sanctions over the offensive and with his decision to send a delegation headed by Vice President Mike Pence and Secretary of State Mike Pompeo to make the case for a ceasefire to Turkey’s president in person. But Trump reignited the feud Wednesday morning when he claimed the conflict "has nothing to do with us."

Speaking to reporters in the Oval Office, Trump also asserted that Kurdish fighters, who allied with the U.S. and did a great deal of the fighting to defeat ISIS over the last half decade, were “not angels.”

That prompted a few barbs from Graham, which Trump was then asked about at the later news conference.

"I hope President Trump is right in his belief that Turkey’s invasion of Syria is of no concern to us, abandoning the Kurds won’t come back to haunt us, ISIS won’t reemerge, and Iran will not fill the vacuum created by this decision," Graham said Wednesday. "However, I firmly believe that if President Trump continues to make such statements this will be a disaster worse than President Obama’s decision to leave Iraq."

And in a tweet, Graham said that Trump's apparent indifference toward the Kurds "completely undercut" Pence and Pompeo on their impending trip to meet with Turkish President Recep Tayyip Erdogan, hampering their "ability to end the conflict."