During the Vietnam War, Trump had obtained four educational deferments before graduating from college. "If we are going to ask every American to serve, every American should serve".
Bone spurs are a calcium deposit that causes a bony protrusion on the underside of the heel bone.
In the C-SPAN interview, McCain said the lessons learned from Vietnam include that the United States needs to have a "strategy and a capability to win" before getting involved in a conflict. "But I was entered into the draft and I got a very, very high draft number".
The two men have gone back and forth over the course of Trump's presidency, with Trump calling into question the valor of McCain's service and threatening to "fight back" against the Arizona senator's criticisms.
It isn't totally clear if McCain meant to single out Trump, but McCain's mention of bone spurs comes after he and Trump exchanged words last week over the the six-term senator's recent criticism of "half-baked, spurious nationalism".
Sen. John McCain, R-Ariz., receives the Liberty Medal from the National Constitution Center in Philadelphia, Oct. 16, 2017.
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"He was a war hero because he was captured, " Trump said during the campaign.
The Vietnam War has been invoked before in a long-simmering battle between Trump and McCain.
"I'm being very nice".
"I've faced greater challenges than this", McCain told reporters the next day, referencing his time in a POW camp after being threatened by Trump.
Specifically, he said: 'I like people who weren't captured'.
McCain, a Vietnam veteran who was shot, captured and held for more than five years as a prisoner of war, subtly talked about the president's five draft evasions, including one involving a doctor saying he had bone spurs in 1968.
McCain's remarks come amid a growing chorus of concern over President Trump's leadership from both sides of the political aisle.