Former U.S. president Donald Trump was golfing on his course in Palm Beach, Fla., Sunday afternoon when the Secret Service say they spotted the barrel of a gun in the bushes. It was what they believe to be the second potential attempt at assassinating Trump in just two months.

The suspect, arrested after a brief pursuit, was Ryan Welsey Routh: a 58-year-old from North Carolina who's been interviewed in the past about trying to recruit Afghan fighters to join the war effort in Ukraine.

Marin Cogan, a senior correspondent for Vox, walks us through what happened, what else we know about the suspect and the tinderbox of a highly polarized and heavily armed America.

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