Rumsfeld, architect of an unpopular war in Iraq, intends to resign after six stormy years at the Pentagon, Republican officials said.

The development occurred one day after midterm elections that cost Republicans control of the House, and possibly the Senate, as well. Surveys of voters at polling places said opposition to the war was a significant contributor to the Democratic victory.

Bush described Rumsfeld as a "superb leader" in a time of change, but said his defense chief recognizes the value of "fresh perspective." He said Rumsfeld is a "trusted adviser and friend," and that he's "deeply grateful" for his service to the country. Bush said he and Rumsfeld agreed that "the timing is right for new leadership" at the Pentagon.

Last week, as he campaigned to save the Republican majority, Bush declared that Rumsfeld would remain at the Pentagon through the end of his term.

Rumsfeld, 74, was in his second tour of duty as defense chief. He first held the job a generation ago, when he was appointed by President Ford.