WASHINGTON – Several U.S. Supreme Court justices yesterday sharply questioned whether female employees at Wal-Mart stores can proceed with the largest class-action sex-discrimination lawsuit in history that seeks billions of dollars.

At issue in the case was whether a small group of women can represent a nationwide class that could total millions of women.

After listening to the attorneys, the top court took the case under advisement, with a ruling expected by late June. The decision could change the legal landscape for workplace and other class-action lawsuits.