The former mayor of Knoxville, Tennesse, and state lawmaker said in April he was prepared to return to Tennessee later this year, assuming he would serve the average three-year term for ambassadors.
But Bush, through an aide, asked him to stay, and Ashe said yes.
"It is a great honor to stay here for basically another year and a half," Ashe told The Knoxville News Sentinel's Washington bureau in a phone interview from Warsaw. "There's a lot going on here that I'm happy to continue working on."
The extended tour gives Ashe a chance to be part of planning a possible U.S. missile defense system in Poland. Bush plans a visit to Poland in about two weeks.
Ashe was sworn in as ambassador June 23, 2004.