From North Korea to Iran to Russia, a president-elect with civilisation-ending weaponry at his fingertips will face an in-tray of potential international crises
On Donald Trump’s first day in office he will be handed the “nuclear biscuit” – a small card with the codes he would need to talk to the Pentagon war room to verify his identity in the event of a national security crisis.
Some presidents have chosen to keep the “biscuit” on them, though that is not foolproof. Jimmy Carter left his in his clothes when he sent them to the dry-cleaners. Bill Clinton had it in his wallet with his credit cards, but then lost the wallet.