Trump Faces Backlash Over Criticism of Slain Army Capt. Khan's Family

Humayun Khan, a Muslim U.S. Army captain, was killed in a suicide car bombing in Iraq in 2004.
8:15 | 08/02/16

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Transcript for Trump Faces Backlash Over Criticism of Slain Army Capt. Khan's Family
? you're just a lost boy yeah I know who you are you don't know ? ? what you lost boy you're too busy chasing stars ? ? and you're always gonna fly away just because you know you can ? ? you're never gonna learn there's no such place as neverland ? ? you don't understand you'll never grow up you're never gonna be a man ? ? you're never grow up yeah you're never gonna be a man peter pan ? ? never gonna be a man ? ? This is "Nightline." Tonight, Donald Trump not just doubling down. Well, I was very viciously attacked -- But tripling down on his comments about the gold star parents of captain khan.

This transcript has been automatically generated and may not be 100% accurate.

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