text:  This is The World. I'm Carolyn Beeler. Thank you for joining us today. Two days after the attempted assassination of Donald Trump, U.S. authorities say they're determined to find out what happened, how it happened, and why. Administration officials are already calling Saturday's shooting at a campaign rally in Pennsylvania a failure of security. The Secret Service is facing scrutiny after a 20-year-old man fired a rifle at the former president from a rooftop.