Apologize? This is not a simple mistake one could get over with by simply standing up and saying, "Okay, I am sorry." Trump has been openly critical of Muslims worldwide let alone of those in his own country. His statement is a true reflection of his inner self. He insulted the family of a Muslim US soldier who was posthumously awarded the Bronze Star Medal, and the Purple Heart which I believe is the highest US military award when Captain Humayun Khan laid down his life protecting the lives of soldiers under his command.
Trump is a person who has lost control of his moral compass, He is a man with a black soul.