It would be inconceivable for the United States to go through with a deal supplying advanced F-35 fighter jets to Turkey, 44 members of the House of Representatives have warned in a letter to U.S. Secretary of Defense James Mattis. Turkey, a NATO ally of the United States and a low level partner in the jets production, is set to receive the first of 100 of the jets on order at a rollout ceremony in the United States scheduled for Jun.