Saudi Arabia’s powerful heir apparent, Crown Prince Mohammed bin Salman, is visiting Washington and other American cities this week promoting his image as an enlightened reformer out to modernize his conservative country and encourage foreign investment.

That image is stained by his chief foreign policy initiative, the humanitarian catastrophe that is the war in Yemen, in which at least 10,000 civilians have been killed, many as a result of indiscriminate airstrikes by the Saudis and their Persian Gulf partners. The United States has been Saudi Arabia’s main enabler, supplying weapons and other military aid.

There was no immediate sign that President Trump used his meeting with the crown prince at the White House on Tuesday to try to persuade him to halt the war.

Some members of Congress, understanding their constitutional responsibilities over how and when the United States wages war, proposed a bipartisan resolution to end American military involvement in Yemen within 30 days unless Congress formally authorizes it. Tragically, it was effectively defeated Tuesday when the Senate voted 55 to 44 to table the measure. Other legislative efforts yet to be considered would block military aid to Saudi Arabia, including millions of dollars in arms sales.