Year after year, the bombs fell — on wedding tents, funeral halls, fishing boats and a school bus, killing thousands of civilians and helping turn Yemen into the world’s worst humanitarian crisis.

Weapons supplied by American companies, approved by American officials, allowed Saudi Arabia to pursue the reckless campaign. But in June 2017, an influential Republican senator decided to cut them off, by withholding approval for new sales. It was a moment that might have stopped the slaughter.

Not under President Trump.

With billions at stake, one of the president’s favored aides, the combative trade adviser Peter Navarro, made it his mission to reverse the senator. Mr. Navarro, after consulting with American arms makers, wrote a memo to Jared Kushner and other top White House officials calling for an intervention, possibly by Mr. Trump himself. He titled it “Trump Mideast arms sales deal in extreme jeopardy, job losses imminent.”

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