Since his six-minute speech at last summer’s Democratic Convention, Khizr Khan has become a kind of celebrity, an honorable everyman who stood up for America’s Muslim community. The story he told of his son Humayun, a captain in the U.S. Army who gave his life to stop a suicide bomber approaching his troops in Iraq, in 2004, was emotional, and it made for gripping television. The Washington Post called the image of Khan waving his pocket-size Constitution in the air—and asking if Donald Trump had ever read it—one of the most memorable of the campaign. “I will lend you my copy,” Khan said, addressing Trump. “You have sacrificed nothing and no one.” His speech made the Constitution a best-seller on Amazon. Google searches on it soared tenfold.