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President Trump and Sen. John McCain (R-AZ) traded jabs again this week as the president responded to McCain's criticism by warning "at some point I fight back."

The Arizona senator criticized Trump at the National Constitution Center in Philadelphia as he received the Center's Liberty Medal.

"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," McCain stated with passion.

The president later responded during a series of radio hits Tuesday.

"People have to be careful because at some point I fight back," Trump said on "The Chris Plante Show." "You know, 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 appeared unaffected, however, and told a group of reporters he was not intimidated by the warning.

"I have faced some pretty tough adversaries in the past," he said. "I'm not interested in confronting the president. I'm interested in working with the president."

McCain also denied he was blocking legislation such as the health care reform bill because of a personal grudge against Trump.

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