Enrichment of nuclear material on Saudi soil could lead to a regional nuclear arms race and a dangerous loss of control.".The United States and Iran have exchanged new threats, as US President Donald Trump prepares to farewell US service members killed in Iranian attacks.In a post on social media, President Trump has warned the US will destroy one bridge or power plant for every future Iranian strike in the Strait of Hormuz.In response, Iran's top joint military command has said if the US acts on its threats, Tehran will stop all Gulf oil flow and target oil, gas, electricity and economic infrastructure in the region.The exchange come as President Trump is headed to Dover Air Force Base for a ceremony for the four US service members killed in Iranian attacks in the Middle East over the past week."We're going to Dover They won't have a nuclear weapon