WASHINGTON (Reuters) - A U.S. State Department spokesman, commenting on remarks by Philippine President Rodrigo Duterte on Monday calling for the withdrawal of U.S. special forces from a southern island, said Washington had not officially received such a demand. State Department spokesman John Kirby told a news briefing that he had seen reports about Duterte’s comments, but “we are not aware of any official communication by the Philippine government ... to seek that result.” The United States is committed to its alliance with the Philippines, he added. 