Can NATO survive Trump's changes of heart?

These days, every official visit, every summit that involves the President of the United States seems like a mad scramble to keep the leader of the Atlantic Alliance on board. But what if it’s just too late? Last month, leaders left France thanking their lucky stars that Donald Trump hadn’t taken a big bazooka to the G7 Ankara, a darker Donald threatening to pull all US troops from Europe, cut trade with Spain and blasting Nato for its unwillingness to join his war against Iran.