Supreme Court Justice John Paul Stevens has hired fewer law clerks than usual, generating speculation that the leader of the court's liberals will retire next year.

If Stevens does step down, he would give President Barack Obama his second high court opening in two years. Obama chose Justice Sonia Sotomayor for the court when Justice David Souter announced his retirement in May.

Souter's failure to hire clerks was the first signal that he was contemplating leaving the court.

Stevens, 89, joined the court in 1975 and is the second-oldest justice in the court's history, after Oliver Wendell Holmes. He is the seventh-longest-serving justice, with more than 33 years and eight months on the court.

In response to a question from The Associated Press, Stevens confirmed through a court spokeswoman Tuesday that he has hired only one clerk for the term that begins in October 2010. He is among several justices who typically have hired all four clerks for the following year by now. Information about this advance hiring is not released by the court but is regularly published by some legal blogs.

Stevens did not say whether he plans to hire his full allotment of clerks or whether he will leave the court at the conclusion of the term that begins next month. Retired justices are allowed to hire one clerk.