AL ASAD AIR BASE, Iraq, Sept 3 (Reuters) - U.S. President George W. Bush said on Monday any reduction in U.S. troop numbers in Iraq would be based on calm assessment and the "not nervous reaction" of politicians in Washington. Bush was addressing troops on a visit to Iraq to meet U.S. commander General David Petraeus and Ambassador Ryan Crocker for a final review of the war before a showdown in Congress over troop levels.
