President Biden’s plan to sell F-16 fighter jets to Turkey faced another potential roadblock on Thursday when 27 U.S. senators, most of them Democrats, informed him in a letter that if Ankara does not stop blocking Sweden and Finland’s entry into NATO, Congress will not support the sale. “Congress cannot consider future support for Türkiye, including the sale of F-16 fighter jets, until Türkiye completes ratification of the accession protocols [for the two countries’ admission into NATO],” wrote the senators. Sweden and Finland last year applied to join the transatlantic alliance, jettisoning long-held neutrality in response to the Russian invasion....