Theresa May would fire Britain’s nuclear weapons as a ‘first strike’ if necessary, the Defence Secretary has said. Michael Fallon said the Prime Minister was prepared to launch Trident in “the most extreme circumstances”, even if Britain itself was not under nuclear attack. The statement came as the Conservatives continued to exploit Labour divisions on the retention of the Trident deterrent, to warn of the “very dangerous chaos” if Jeremy Corbyn becomes prime minister.