A seemingly divided Supreme Court struggled Wednesday with its first major abortion case of the Trump era, leaving Chief Justice John Roberts as the likely deciding vote.

Roberts did not say enough to tip his hand in an hour of spirited arguments at the high court.

The court’s election-year look at a Louisiana dispute could reveal how willing the more conservative court is to roll back abortion rights. A decision should come by late June.

The outcome could have huge consequences at a time when several states have passed laws, being challenged in the courts, that would ban abortions after a fetal heartbeat is detected, as early as six weeks.

The justices are weighing a Louisiana law requiring doctors who perform abortions to have admitting privileges at a nearby hospital. A federal judge found that just one of Louisiana’s three abortion clinics would remain open if the law is allowed to take effect. The federal appeals court in New Orleans, though, upheld the law, setting up the Supreme Court case.

Justice Ruth Bader Ginsburg noted, as she had before, that “among medical procedures, first trimester abortion is among the safest, far safer than childbirth.” The abortion clinic in Shreveport at the heart of the case reported transferring just four patients to a hospital out of roughly 70,000 it has treated over 23 years, Justice Elena Kagan noted.