Maybe you should find out what Trump actually said:
Late Saturday night, Trump released a statement calling Humayun Khan a hero but disputing his fathers characterization.
While I feel deeply for the loss of his son, Mr. Khan who has never met me, has no right to stand in front of millions of people and claim I have never read the Constitution, (which is false) and say many other inaccurate things, said Trump.
http://www.pbs.org/newshour/rundown/donald-trump-attacks-muslim-fathers-convention-speech/
I hope he will repeat the hero part again and again