Not yet 100 days into Donald Trump’s presidency, the populist revolution he seemed to promise is already over — at least for now. Two weeks of head-spinning policy reversals have put Trump squarely inside the chalk lines of conventional Republican conservatism on both economics and foreign affairs.
His impulsive management style and his fact-challenged rhetoric are still intact. But most of his policy positions are now remarkably similar to those espoused by the GOP’s last establishment nominee, Mitt Romney, in 2012.
In foreign policy, Trump once derided traditional alliances like the North Atlantic Treaty Organization, said he’d seek an alliance with...