Watch Donald Trump continue war of words with John McCain: 'He's only a war hero because he was captured'

GOP frontrunner Donald Trump continued his attacks on fellow Republicans by mocking 2008 GOP presidential nominee John McCain's military background, saying “He’s a war hero ’cause he was captured. I like people that weren’t captured.”

Speaking with host Frank Luntz, Trump returned fire at McCain who earlier criticized the bombastic businessman for "firing up the crazies" last weekend during a rally in his home state of Arizona.

"He's a war hero cause he was captured!" Trump said, before adding, "I like people that weren't captured" causing the audience to laugh.

Trump continued, "He's a war hero, but right now he said some very bad things about a lot of people. So what I said was, 'John McCain, I disagree with him they are crazy.' And, very importantly -- I speak the truth -- he graduated last in his class at Annapolis. So I said 'nobody knows that.' That he graduated last or second to last, and he was upset, and I said 'For what? Telling the truth?'"

McCain was shot down over Hanoi in 1967 and remained a POW until 1973, during which he time he was tortured and refused repatriation back to the US while leaving his fellow servicemen behind.

For his part, Trump avoided military service during the war, receiving multiple deferments.

Earlier in the week, Trump took some shots at Republican rival Rick Perry, saying the former governor of Texas should be required to take an IQ test before being allowed into the GOP debates.

Watch the video below from uploaded to YouTube by politicalturkey: