U.S. soldiers gather for a brief during a combined joint patrol rehearsal in Manbij, Syria on Nov. 7, 2018. The United States’ main ally in Syria on Thursday, Dec. 20, 2018, rejected President Donald Trump’s claim that Islamic State militants have been defeated and warned that the withdrawal of American troops would lead to a resurgence of the extremist group. (U.S. Army photo by Spc. Zoe Garbarino via AP)