David Lammy has said he is already engaging with Donald Trump’s controversial running mate, JD Vance, and can identify with him because of their common working class and Christian backgrounds. The British foreign secretary was speaking just hours after the possible future US vice-president reiterated his “America first” views, pledging to the Republican national convention (RNC) that he would not send US soldiers to war abroad unnecessarily. “We will send our kids to war only if we must,” Vance said, signalling a significant policy shift for the US which has cemented its position as the defender of the world’s democracies...