NEW: More than 50,000 U.S. service members are now operating across the Middle East as President Trump gives a dire warning to Iran. President Trump says the U

NEW: More than 50,000 U.S. service members are now operating across the Middle East as President Trump gives a dire warning to Iran. President Trump says the U.S. will destroy "one bridge or power plant" for every time Iran fires on a ship in the Strait of Hormuz. Trump also says Iran is not ready…