"Donald Trump, you're asking Americans to trust you with their future. Let me ask you, have you even read the United States Constitution? I will gladly lend you my copy," he said.
"Have you ever been to Arlington Cemetery? Go look at the graves of brave patriots who died defending the United States of America. You will see all faiths, genders and ethnicities. You have sacrificed nothing -- and no one."
The gravesite of his son, Capt. Humayun Khan, at Arlington National Cemetery almost immediately became a pilgrimage site of sorts, and was decorated with flowers, flags and notes from visiting strangers.
Ghazala Khan, whom Trump criticized for not speaking while standing next to her husband on the convention stage, later described her pain an op-ed in The Washington Post.
The Khans have become emblems of Gold Star military families, a designation given to those whose sons or daughters have been killed in war.