NEW YORK — Donald Trump’s aides have requested a slew of stepped-up security measures, including military aircraft capable of shooting down surface-to-air missiles to transport the former president in the race’s final stretch, amid growing concerns over threats from Iran in a campaign already shaken by violence.

The campaign’s highly unusual request comes as the Republican candidate faces death threats from Iran, which has also targeted other former Trump administration officials and has also been blamed for a widespread hack of top campaign officials. Trump narrowly survived one assassination attempt and U.S. Secret Service agents foiled a second, though neither case has been publicly linked to Iranian actors.