Japan's Abe, Okinawa governor clash over U.S. base before U.S.-Japan summit

TOKYO (Reuters) - Japanese Prime Minister Shinzo Abe and the governor of the southern island of Okinawa clashed on Friday over the relocation of a contentious U.S. air base, an irritant in U.S.-Japan ties, a week before Abe's high-profile visit to the United States.