ANKARA, July 8 (Reuters) - U.S. President Donald Trump said on Wednesday he had ordered his Treasury Secretary Scott Bessent to cut off all trade with Spain, calling Madrid a "terrible partner" in NATO. Trump was speaking alongside NATO Secretary General Mark Rutte ahead of an alliance summit in Ankara. (Reporting by Humeyra Pamuk; Writing by Tuvan Gumrukcu; Editing by Sharon Singleton)