David Feith writes: Barack Obama’s farewell visit to Asia this week was marred by a nasty spat with an important ally: firebrand Philippine President Rodrigo Duterte, who called the U.S. president a “son of a whore” and caused the cancellation of a bilateral meeting. This breaks from the recent Asian diplomatic norm of China provoking crises and the U.S. generally strengthening ties with regional allies. But the alliance headaches caused by Mr. Duterte could preview what’s to come for the next U.S. president, whether Hillary Clinton or Donald Trump. – Wall Street Journal
- Kristol on American leadership