The U.S. Supreme Court was expected on Monday to decide a case involving a legal challenge to a Federal Reserve regulation on debit card "swipe fees" in a ruling that could make it easier for businesses to try to overturn longstanding federal rules.

The U.S. Supreme Court on Monday ruled that merchants may challenge debt-card swipe fees outside a six-year statute, sending a shock to the power of federal agencies. The justices voted 6-3 on their ruling,

The US Supreme Court dealt a fresh blow to the authority of federal agencies, ruling in a case over debit-card swipe fees that some regulations can be challenged a decade or more after they were enacted.

The ruling could amplify the impact of a separate decision overturning the Chevron doctrine, which had required courts to defer to executive agencies’ interpretations of statutes.

The Supreme Court opened the door Monday to new, broad challenges to regulations long after they take effect, the third blow in a week to federal agencies. The justices ruled 6-3 in favor of a truck stop in North Dakota that wants to sue over a regulation on debit card swipe fees that the federal appeals court in Washington upheld 10 years ago.

The ruling came on the final day of the Supreme Court's term that began in October. Swipe fees, also called interchange fees, reimburse banks for costs involved in offering debit cards. The fees are determined by Visa,