Washington (CNN)President Donald Trump, hours after Sen. John McCain delivered a speech that repudiated the President, warned the Arizona Republican to “be careful” because at some point he will “fight back.”

McCain, while accepting the Liberty Medal in Philadelphia on Monday night, warned the United States against turning toward “half-baked, spurious nationalism cooked up by people who would rather find scapegoats than solve problems.”

The speech was a repudiation of Trump, who the Arizona Republican has long feuded with, and the worldview that catapulted him to office.

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“Yeah, well I hear it. And people have to be careful because at some point I fight back,” Trump said. “I’m being very nice. I’m being very, very nice. But at some point I fight back, and it won’t be pretty.”