Gov. Tom Corbett is suing County Register Bruce Hanes to make him stop violating the Pennsylvania state law that defines marriage as between a man and woman.
Corbett initiated the suit to put a halt to illegal same-sex marriages taking place in the county of Montgomery.
Last week, Hanes defied a state ban on gay marriage and started issuing licenses to homosexual couples. He's issued at least 34 such licenses so far.
Hane's started issuing gay marriage licenses after the state Attorney General Kathleen Kane said she will no longer defend the law.
"I am encouraged by Gov. Corbett's decision to use his authority to stop the intentional breaking of law by a local elected official," Sam Rohrer, president of the Pennsylvania Pastors' Network, said.
"As I and others stated in our July 17 press conference...Attorney General Kane's public refusal to uphold her oath of office and defend the State's Marriage Law would encourage greater lawlessness," he added.
Rohrer also said "Corbett is justified to use his authority to seek the compliance with the law as the Constitution demands."