The Mississippi attorney general’s office is expected to file briefs with the U.S. Supreme Court on Thursday to outline the state’s arguments in a case that could upend nearly 50 years of court rulings on abortion rights nationwide. A 6-3 conservative majority, with three justices appointed by former President Donald Trump, said in May that the court would consider arguments over a Mississippi law that would ban abortion at 15 weeks. Justices are likely to hear the case this fall and could rule on it in the spring. The case challenges rulings that have prohibited states from restricting abortion before a fetus can survive outside the womb. Abortion rights supporters have said that if justices uphold the Mississippi law, that could clear the way for states to enact more restrictions on the procedure, including bans on abortion once a fetal heartbeat is detected, as early as six weeks.