U.S. Secret Service Director Kimberly Cheatle admitted to Congress on Monday that she and her agency failed when a would-be assassin wounded Republican presidential candidate Donald Trump, but rebuffed bipartisan calls to resign. "We failed," Cheatle said in testimony before the House of Representatives Oversight Committee. "The assassination attempt on former President Donald Trump on July 13th is the most significant operational failure at the Secret Service in decades." Republican...