Donald Trump famously made Saudi Arabia his first foreign stop as president, where he embraced the Saudi leadership unquestioningly. There is a good possibility that Saudi Arabia will also be his last foreign port of call if he loses the November 2020 election. It makes sense for his critics now to start developing a new American strategy toward the kingdom.

Despite mounting concern about the reckless and dangerous behavior of Saudi Crown Prince Mohammed bin Salman, Trump embraced him last week in Osaka at the G-20, just as he has embraced him in every meeting they have had. This is despite a new report from the United Nations special rapporteur that found the crown prince personally responsible for the kingdom’s premeditated murder of Jamal Khashoggi in Istanbul last year. The next G-20 will be held in Riyadh a couple of weeks after the American election. Trump could be a very lame duck. If he loses, not many countries will want to be hosting his final Twitter tantrums.

As heinous as the coldblooded murder of a Washington Post journalist was, it pales next to the crown prince’s signature policy initiative, which is the bloody war in Yemen. Foolishly confident that he could gain a quick and decisive victory, the prince embarked on an invasion of Yemen with no strategy and no achievable end state.

More than four years later, the war is a brutal stalemate. The Saudis and their allies have launched more than 20,000 airstrikes on Yemen, and the Houthi rebels are firing missiles, rockets and drones into the kingdom. The crown prince, often referred to by his initials MBS, has never visited Aden, the "capital" of his Yemeni allies, and most of his other allies have quietly deserted the war. Even the United Arab Emirates is pulling out its troops.