The Supreme Court on Thursday unanimously preserved access to a medication that was used in nearly two-thirds of all abortions in the U.S. last year, in the court’s first abortion decision since conservative justices overturned Roe v. Wade two years ago.

The nine justices ruled that abortion opponents lacked the legal right to sue over the federal Food and Drug Administration’s approval of the medication, mifepristone, and the FDA’s subsequent actions to ease access to it. The case had threatened to restrict access to mifepristone across the country, including in states where abortion remains legal.

Justice Brett Kavanaugh, who was part of the majority to overturn Roe, wrote for the court on Thursday that “federal courts are the wrong forum for addressing the plaintiffs’ concerns about FDA’s actions.”

The decision could lessen the intensity of the abortion issue in the November elections, with Democrats already energized and voting against restrictions on reproductive rights. But the high court is separately considering another abortion case, about whether a federal law on emergency treatment at hospitals overrides state abortion bans in rare emergency cases in which a pregnant patient’s health is at serious risk.

More than 6 million people have used mifepristone since 2000. Mifepristone blocks the hormone progesterone and primes the uterus to respond to the contraction-causing effect of a second drug, misoprostol. The two-drug regimen has been used to end a pregnancy through 10 weeks gestation.

Health care providers have said that if mifepristone is no longer available or is too hard to obtain, they would switch to using only misoprostol, which is somewhat less effective in ending pregnancies.

President Joe Biden’s administration and drug manufacturers had warned that siding with abortion opponents in this case could undermine the FDA’s drug approval process beyond the abortion context by inviting judges to second-guess the agency’s scientific judgments. The Democratic administration and New York-based Danco Laboratories, which makes mifepristone, argued that the drug is among the safest the FDA has ever approved.