Even so, Saudi’s ongoing fighting in Yemen has the potential to strain the friendship between the kingdom and the United States, especially in the wake of the blockade, which humanitarian groups described as increasingly dire for Yemen’s civilian population.

Last month, a missile fired from Yemen stuck near the Saudi capital’s airport. Afterward, the kingdom tightened an earlier blockade, closing all of Yemen’s seaports and airports. Those restrictions since have been slightly loosened, but aid groups still say that not enough food or fuel is getting in to prevent further deterioration in the humanitarian situation. The United Nations Security Council on Tuesday said Yemen “stands on the brink of a catastrophic famine.”

American politicians, including Republicans, have urged Mr. Trump to use his leverage with the Saudis to help civilians dying of starvation and lack of medicine in Yemen.

Senator Todd Young, Republican of Indiana, has called on the president and…

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