Khizir Khan spoke at the convention in Philadelphia that nominated which person for Democratic presidential candidate?
Khizr and Ghazala Khan:  The couple received international attention following a speech at the 2016 Democratic National Convention that criticized Republican presidential candidate Donald Trump. 2016 Democratic National Convention:  Former U.S. Secretary of State, Hillary Clinton, was chosen as the party's nominee for president by a 59.67% majority of delegates present at the convention roll call, defeating primary rival Senator Bernie Sanders, who received 39.16% of votes from delegates, and becoming the first female candidate to be formally nominated for presidential by a major political party in the United States.
Hillary Clinton