Commentary It’s normal during Prime Minister’s Questions time in the House of Commons for opposition parties to attack the UK government’s record in often-heated exchanges, but on Jan. 19, Boris Johnson suffered the strongest attacks from his own side. The most serious of these came from former Cabinet minister David Davis, who ended his comments to the prime minister brusquely: “You have sat there too long for all the good you have done. In the name of God, go.” Johnson was, for once, lost for words and fumbled, “I don’t know what quotation he is alluding to.” But not to be familiar that historic and fateful line is surprising for an Oxford-educated politician. Davis was citing member of Parliament Leopold Amery’s 1940 takedown of then-Prime Minister Neville Chamberlain, which led to his resignation three days later, to be replaced by Winston Churchill. Amery borrowed the quote from a speech delivered by Oliver Cromwell on …