All 10 former US defence secretaries still living, including two who worked for Donald Trump, have called for the president and his supporters to accept he lost the election and warned against attempts to involve the military in his increasingly desperate efforts to overturn the result. In an unprecedented joint letter published in the Washington Post, the defence secretaries addressed the worst fears of what could happen in 17 days of Trump’s administration remaining before Joe Biden’s inauguration: an attempt by Trump to foment a crises with the aim of triggering a military intervention in his last-ditch struggle to hold...