KUWAIT CITY (AP) — The Trump administration's appeal for unity fell on a critical deaf ear Tuesday as the latest expression of U.S. support for Kurdish rebels in Syria enraged America's NATO ally, Turkey, and overshadowed Secretary of State Rex Tillerson's plea for nations fighting the Islamic State to overcome rivalries and concentrate on eradicating the extremist group from the Middle East.

While Tillerson sounded the alarm over distractions that threaten the gains of the anti-IS coalition, Turkish President Recep Tayyip Erdogan bashed the United States for proposing to send $550 million dol...