WASHINGTON - Sandra Day O'Connor, the first woman on the Supreme Court and a swing vote on abortion as well as other contentious issues, announced her retirement Friday. A bruising Senate confirmation struggle loomed as President Bush pledged to name a successor quickly.

"It has been a great privilege indeed to have served as a member of the court for 24 terms," the 75-year-old justice wrote Bush in a one-paragraph resignation letter. "I will leave it with enormous respect for the integrity of the court and its role under our constitutional structure."

Little more than an hour later, Bush praised O'Connor as "a discerning and conscientious judge and a public servant of complete integrity."