text:  A group of speakers, including House Majority Leader Mike Johnson, Senator Ted Cruz, and former GOP presidential hopeful Nikki Haley, are expected to speak in support of former President Trump to take on Democrat Joe Biden. Intelligence about a threat from Iran led the Secret Service to boost security for Donald Trump before Saturday's assassination attempt targeting the former president. Officials say there's no indication the Iran threat is in any way connected to the shooting. More from NPR's Ryan Lucas.