Donald Trump’s political career arguably began with full-page ads he purchased in several newspapers in September 1987 in order to denounce Saudi Arabia, along with Japan, for “taking advantage of the United States.” Trump suggested, among other things, that the United States had no business defending the Persian Gulf, “an area of only marginal significance” for U.S. interests. He said the Saudis should “pay for the protection we extend as allies.”

Through the following three decades, Trump stuck to that message. Yet in his inaugural foreign excursion as president, he will touch down first not in Ottawa or London, but in Riyadh, where he will celebrate what is being described as a renaissance of the U.S.-Saudi relationship. Trump is expected to announce enhanced U.S. support for the kingdom and its Gulf allies, including help with the formation of a defense alliance. The administration has also signed off on upward of $100 billion in arms sales to Saudi Arabia and the United Arab Emirates.

This upgraded alliance might be described as a roundabout response to Trump’s old critique. Administration officials say the massive Saudi purchases, though not a direct payment for U.S. defense, will create jobs in the United States and advance the day when the Persian Gulf states can defend themselves. Mostly, however, Trump’s sudden embrace of a regime he once excoriated reflects the success of an assiduous Saudi lobbying campaign.

The U.S. alliance with Saudi Arabia is worth preserving: Trump’s 1987 critique was way off base. But the administration’s new fervor for the tie appears to lack the healthy skepticism the Obama administration developed about Saudi enmity toward Shiite Iran, which appears to be driven by sectarian as well as strategic considerations. Iran’s aggression in the region should be resisted, but that should not mean depriving Shiites in Saudi Arabia, Bahrain and elsewhere of legitimate rights.

Senior U.S. officials also appear dangerously blasé about Saudi military intervention in Yemen, an unwinnable war that has led to thousands of civilian deaths in bombings and has brought the country to the brink of famine. .

Defense Secretary Jim Mattis said during a visit to Saudi Arabia last month that the administration sought a political solution in Yemen, but he did not publicly oppose a possible Saudi offensive against Hodeida, through which the bulk of Yemen’s food supplies now flow. A stand-down there ought to be the first return on the revamped relationship. Otherwise, Saudi Arabia really will be taking unfair advantage of the U.S.