In the moments after an assassination attempt on Donald Trump’s life, BBC Senior North America Correspondent Gary O’Donoghue spoke to an eyewitness who claimed he had seen a gunman on a roof.

The interview went viral, mostly because what the man had seen was so significant – but in part because he was such a compelling character.

Talking to the BBC’s Media Show, O’Donoghue shares a behind-the-scenes account of the interview. He reveals his initial disbelief and his process of verifying the eyewitness’ story.