After Trump's warning, McCain says, 'I have faced tougher adversaries'

U.S. Sen. John McCain jabbed at unnamed pushers of isolationist politics, saying at his National Constitution Center Liberty Medal ceremony in Philadelphia that abandoning America's role as an global leader is "unpatriotic". They do not necessarially share the same worldview, though.

Early on in his campaign, Trump said that McCain, a former POW, is not a real war hero.

The relationship between the pair - one a veteran lawmaker and war hero, the other a real estate tycoon and political neophyte before he assumed the presidency - has always been testy.

Asked by AFP what he made of the president's latest missive, McCain shrugged the matter off.

Asked yesterday whether this was a rebuke of his party's president, McCain added that he was really referring to "America Firsters" - which only reinforced impressions that Trump and his followers were his intended targets.

McCain responded to Trump's comments moments later, saying that he has "faced far greater challenges than this", according to CNN.

McCain alluded to Trump's foreign policy as "half-baked, spurious nationalism" and said it was "unpatriotic".

McCain appeared to take his revenge last night as he was awarded the Liberty Medal in Philadelphia by Joe Biden, the former vice president.

What is it, exactly, that Trump believes "won't be pretty"?

In a radio interview with Fox News radio host Brian Kilmeade, Mr Trump suggested President Barack Obama did not call John Kelly, a former Marine general who is now White House chief-of-staff, when his son, Marine Second Lieutenant Robert Kelly, was killed in Afghanistan in 2010. At that rally, Trump hammered McCain for being soft on immigration.

Sen. Mazie HironoMazie Keiko HironoTop general says Iran complying with nuclear deal Live coverage: Sanders rolls out single-payer bill Where Dems stand on Sanders's single-payer bill MORE (D-Hawaii) argued Tuesday that President Trump's attacks on Sen. "That leadership has had its costs, but we have become incomparably powerful and wealthy as we did", McCain said.

That includes tax reform and counter terror efforts, she said, legislation that promotes free markets, and steps to promote prosperity and security around the globe.

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