Donald Trump has asked why I did not speak at the Democratic convention. He said he would like to hear from me. Here is my answer to Donald Trump: Because without saying a thing, all the world, all America, felt my pain. I am a Gold Star mother. Whoever saw me felt me in their heart. Donald Trump said I had nothing to say. I do. My son Humayun Khan, an Army captain, died 12 years ago in Iraq. He loved America, where we moved when he was 2 years old. He had volunteered to help his country, signing up...