In his speech at the Democratic National Convention last week, Khizr Khan, a Muslim-American lawyer and father of a U.S. soldier killed in Iraq, waved a pocket copy of the Constitution in the air and challenged Donald Trump. Referencing the Republican’s call to ban Muslims from entering the country—a policy that would’ve prevented Khan’s heroic son from becoming an American—Khan posed a question to Trump: “Have you even read the United States Constitution?