March for Life rally returns to steps of Supreme Court, where this year justices consider Roe v Wade

The annual March for Life rally in Washington, D.C., takes place Friday in sub-freezing temperatures and once again on the steps of the Supreme Court, where this year the nine justices are considering a change to the court's decades-old ruling in the Roe v. Wade abortion rights case.

The high court last month heard a challenge to its landmark 1973 decision on abortion law and is now considering whether to overturn decades of precedent on such law. The court is expected to announce its ruling in the spring. Overturning the decision would give individual states the right to legislate their own abortion laws. 

"This could be the decision of a generation," anti-abortion activist Kristen Waggoner told NPR. "My hope is that the United States Supreme Court has the courage to do what it ought."

Waggoner, general counsel for Alliance Defending Freedom, a legal advocacy group opposed to abortion rights, is scheduled to speak at the 49-year-old march, which begins Friday morning with temperatures hovering around 17 degrees Fahrenheit. 

Waggoner’s group is working closely with Mississippi's attorney general to help defend a state law banning most abortions after 15 weeks of pregnancy, which is at the center of the Supreme Court case, NPR also reports.