Donald Trump said in 2016 to the Republican National Convention, “We must abandon the failed policy of nation-building and regime change.” Earlier this month, after the current administration launched a war against Venezuela and ousted—one might say changed the regime of—President Nicolás Maduro, Trump said, “We are going to run the country until such time as we can do a safe, proper and judicious transition.” U.S.-led regime change in Venezuela seemed to fly in the face of Trump’s prior warnings against regime change wars. But the president’s defenders said this was a different kind of military operation, unlike the Iraq,...