Trump is expected to announce further U.S. troop withdrawals from Europe after ordering removal of 5,000 troops from Germany.
NATO diplomats say Washington may also cut forces in Italy and cancel plans for long‑range missiles in Germany.
Options discussed include scaling back NATO exercises and relocating troops to more supportive allies such as Poland.
U.S. currently stations about 85,000 troops across Europe, and the moves heighten tensions with Germany and Spain over defense spending.