President Trump issued a stern warning to John McCain after the Senator bashed the Commander-in-Chief’s unabashed nationalism.

The Hill reports:

“People have to careful, because at some point I fight back,” Trump told WMAL radio host Chris Plante. “I’m being very nice. I’m being very, very nice. But at some point I fight back, and it won’t be pretty.” McCain responded to Trump’s comments moments later, saying that he has “faced far greater challenges than this,” according to CNN.

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Speaking at an award ceremony in Philadelphia Monday night, McCain warned against “spurious nationalism” and the dangers of the U.S. abdicating its global leadership responsibilities.

“To fear the world we have organized and led for three-quarters of a century, to abandon the ideals we have advanced around the globe, to refuse the obligations of international leadership and our duty to remain ‘the last best hope of Earth’ for the sake of some half-baked, spurious nationalism cooked up by people who would rather find scapegoats than solve problems is as unpatriotic as an attachment to any other tired dogma of the past that Americans consigned to the ash heap of history,” John McCain said at the National Constitution Center.