Boris Johnson sees method in and admires some of Trump’s apparent madness: not the ‘send them home’ abusive chants about ethnic minority Democrat critics, but the refusal to play by the normal rules of politics or international relations (threatening to nuke North Korea before talking with its despot; imposing new tariffs on China while claiming to want a trade deal; ripping up the international entente with Iran prior to saying just days ago he could be the first US president since the toppling of the Shah to meet an Iranian leader).