 News, Trump assassination attempt. I'm Sheri Preston. As the Republican National Convention kicks off in Milwaukee, questions are still being asked about security in western Pennsylvania. Namely, how did a gunman get close enough to nearly kill a former president, Donald Trump? This morning, ABC's George Stephanopoulos asked Homeland Security Secretary Alejandro Mayorkas about one aspect of security. A letter from the chairman of the House Homeland Security Committee suggests your department may have, quote, rebuffed multiple requests from President Trump's security detail.