President Donald Trump and first lady Melania Trump arrive for the premiere of her movie "Melania" at The John F. Kennedy Memorial Center For The Performing Arts. (Photo: AP)US President Donald Trump on Thursday threatened new tariffs on countries supplying oil to Cuba, escalating a pressure campaign ‍against ⁠the Communist-run island. The move, authorized by an executive order under a national emergency declaration, did not specify any tariff rates ​or single out any ‌countries whose products could face US tariffs.