Republican members of Congress are focusing on the role of the Secret Service, as their frustration and anger grow over the agency's response to an attempt to assassinate presidential nominee Donald Trump. A House committee hearing will on Monday grill its Director, Kimberly Cheatle -something Speaker Mike Johnson said would make for "must-see TV" for Americans concerned about security lapses at a Pennsylvania rally earlier this month. "She's got a lot to answer for. And these concerns...