WASHINGTON (Reuters) - U.S President Donald Trump said on Tuesday that his administration has informed Congress of a potential sale to upgrade the F-16 aircraft in Greece s Air Force, a deal could be worth $2.4 billion.  The U.S. State Department approved the possible sale on Monday. Trump spoke of the potential sale following a meeting with Greek Prime Minister Alexis Tsirpas at the White House. 
U.S. mulls potential F-16 sale to Greece: Trump