The Bush administration has narrowed the search for a new U.S. ambassador to Japan to four men, U.S. officials said Tuesday.

A final selection is expected later this week so that Senate confirmation canbe completed before the Feb. 24 funeral of Emperor Hirohito.U.S. officials said the search has narrowed to:

- Michael Armacost, undersecretary of state for political affairs.

- Gaston Sigur, assistant secretary of state for East Asia and Pacific affairs.

- Lamar Alexander, former Republican governor of Tennessee, now president of the University of Tennessee.

- Barber Conable, president of the World Bank and a former GOP congressman from New York.