While no U.S. president has ever visited Cambodia or Myanmar, Thailand is one of the America's oldest allies in Asia and has been a stop for American commanders in chief since the mid-1960s, according to the State Department historian's office, which compiles records on presidential travel.
George W. Bush visited Thailand twice while president, in 2003 and 2008. Bill Clinton visited in 1996. During the war in neighboring Vietnam, Richard Nixon traveled there in 1969 and Lyndon Johnson in 1966 and 1967, the records show.
Associated Press writers Matthew Pennington and Matthew Lee contributed to this report.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.