 At the Republican National Convention, Vice Presidential nominee J.D. Vance delivered his acceptance speech last night. Donald Trump will do the same this evening. His wife, Melania, and daughter, Ivanka, will be in the audience. Many questions about the lapses in security at Trump's Pennsylvania rally. Officials say the man who tried to assassinate him and did kill a Trump supporter was spotted 20 minutes before he took his first shots. Head of the Secret Service has agreed to testify Monday as she faces growing calls to resign. This is ABC News.