Khizr Khan rose to fame with his emotional pleas against Trump. Now he's targeting the 'politics of fear'

A group of teens and twenty-somethings gathered in a nondescript meeting room at the Long Beach Convention Center, hoping for a chance to say a few words and take a selfie with one of the most fervent opponents of Donald Trump to emerge from the 2016 election.

Khizr Khan, the Gold Star father who...