WASHINGTON — The Supreme Court weighed in on behalf of Arizona's Republican leaders Saturday and cleared the way for them to enforce a new state law that makes it a felony for anyone other than family members and caregivers to deliver mail-in ballots to official polling places.

The high court blocked a Friday ruling of the U.S. 9th Circuit Court of Appeals that had halted the law's enforcement.

Election officials had said they did not plan to vigorously enforce the law. The Arizona Republican Party said it was training volunteers to watch and report people seen dropping off ballots.