Khizr Khan: 'Trump may damage American democracy permanently'

Khan, whose army captain son died in Iraq, gave a speech at the 2016 Democratic convention that was a moral indictment of Trump. Joe Biden, he says, has the character to be president

It was a warning that America chose to ignore, but a moment remembered long after the speeches of career politicians were done and forgotten.

Four summers ago, in the lead-up to the pivotal 2016 US election, Khizr Khan stood before the Democratic national convention in Philadelphia and told how his son, an American Muslim and army captain, died in Iraq. He had a question for Donald Trump, the Republican nominee threatening to ban Muslim immigrants.