Khizr Khan‘s son Humayun Khan, a Muslim American who served as a captain in the U.S. Army, was killed in Iraq in 2004. At the Democratic National Convention Thursday night, Khan made a passionate case against Republican presidential nominee Donald Trump.

Khizr Khan Argues Against Trump

Before Khan and his wife approached the podium, a clip played that showed Democratic presidential nominee  Hillary Clinton memorializing his son. Clinton recounted how Humayun Khan, after instructing his men to seek cover, approached a vehicle packed with explosives as it neared his compound. When the car exploded, Captain Khan was killed instantly. For his brave heroism, he was posthumously awarded the Bronze Star.

At the beginning of his remarks, Khan shared his family’s uniquely American story – how they came here with nothing, how they worked hard, contributed to the democracy they were a part of and saw their sons pursue their dreams. One of their sons, of course, was Humayun Khan.

“Our son, Humayun, had dreams too, of being a military lawyer, but he put those dreams aside the day he sacrificed his life to save the lives of his fellow soldiers,” Khan shared, adding, “Hillary Clinton was right when she called my son ‘the best of America.'”

Khan then turned his attention to Trump, who has notably called for a ban on Muslims, encouraged an increased use of waterboarding and dismissed the notion that Sen. John McCain is a war hero.

“If it was up to Donald Trump, he never would have been in America. Donald Trump consistently smears the character of Muslims. He disrespects other minorities; women; judges; even his own party leadership,” Khan said. “He vows to build walls, and ban us from this country. 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,” Khan added, pulling out his own pocket-constitution. “In this document, look for the words ‘liberty’ and ‘equal protection of law.'”

Khan went on to suggest Trump visit Arlington Cemetery, where rest the graves of fallen soldiers.

“You will see all faiths, genders and ethnicities. You have sacrificed nothing and no one,” Khan said. “We cannot solve our problems by building walls, sowing division. We are stronger together. And we will keep getting stronger when Hillary Clinton becomes our President.”