Along with Republican colleagues, lawmakers have denounced Prince Mohammed for the murder of Mr. Khashoggi — in which he has vehemently denied playing any role — and the mass killing of civilians in the war in Yemen. A top Democrat in the Senate, Robert Menendez of New Jersey, has placed a hold on the sale of certain weapons to Saudi Arabia.
Lawmakers have also expressed apprehension over any move by Saudi Arabia to enrich uranium in its…