How to predict Donald Trump’s foreign policy

JOHN BOLTON, Donald Trump’s national security adviser in 2018-19, has simple advice for anyone trying to understand his former boss’s philosophy on foreign policy: don’t bother. Mr Bolton, who fell out with Mr Trump, says the former president has no consistent principles, only moods, grudges and an obsession with his image. Thus he could both threaten North Korea with “fire and fury” and hold three chummy summits with Kim Jong Un, for example, or both talk about leaving the NATO alliance and then reinforce its eastern flank.