A second lawsuit challenging Pennsylvania's gay marriage ban was filed on Wednesday in Commonwealth Court.

The suit follows a challenge filed two months earlier in federal court.

Plaintiffs in the new lawsuit include twenty-one gay and lesbian couples who married in the state after receiving marriage licenses in Montgomery County, which began issuing such licenses in defiance of state law in July. A court has ordered the county to stop issuing marriage licenses to gay couples. Montgomery County Register of Wills Bruce Hanes announced that he would issue the licenses after Pennsylvania Attorney General Kathleen Kane refused to defend the state's law in the original lawsuit and stated her belief that the law was unconstitutional.

(Related: Pennsylvania clerk to appeal ruling blocking issuance of gay marriage licenses.)

In addition to claiming that the law violates the federal constitution, the new challenge claims that it also violates the Pennsylvania Constitution, the AP reported.

(Related: Pennsylvania pastor fired after marrying gay couple.)