What if the general says 'no' to president's nuclear order?

ABC News -

ABC News—It's hard to overstate how thoroughly the U.S. military has prepared for doomsday — the day America gets into a nuclear shooting war. No detail seems to have been overlooked. There's even a designated "safe escape" door at the nuclear-warfighting headquarters near Omaha, Nebraska, through...

Nuclear launch order can be refused, says US general. Air Force General John Hyten, commander of US Strategic Command, said he and President Donald Trump have had conversations about such a scenario.