WASHINGTON — Sen. Bob Casey, an outlier in his party for his anti-abortion stance, said he will vote in favor of legislation to protect a woman’s access to abortion — a largely symbolic vote just over a week after a leaked U.S. Supreme Court draft opinion revealed the body is poised to overturn Roe v. Wade.

The Pennsylvania Democrat said that he will be an “aye” on Wednesday’s upper-chamber vote to codify Roe because he disagrees with the Texas law at issue in the high court case that would ban abortion at six weeks amid speculation about possible federal legislation that could follow.

“In the nearly three months since the Senate last voted on the Women’s Health Protection Act, the circumstances around the entire debate on abortion have changed. In light of the leaked Supreme Court decision draft overturning Roe v. Wade, and subsequent reports that Republicans in the U.S. House and Senate will introduce legislation to enact a nationwide six-week ban, the real question of the moment is: do you support a categorical ban on abortion? During my time in public office, I have never voted for — nor do I support — such a ban,” he said in a statement Tuesday.

Mr. Casey voted in favor in February when the bill, as expected, failed to advance. The effort Wednesday is likely doomed again in the evenly split Senate, as Democrats will not be able to pick up enough votes to meet the 60-vote threshold and still do not have enough support to break the filibuster.