Sources in Pennsylvania's state capital say a landmark ruling on same-sex marriage is expected Tuesday.
The decision will determine the outcome of a federal lawsuit alleging the state's Defense of Marriage Act and refusal to marry same-sex couples violates the fundamental right to marry and the Equal Protection Clause of the Fourteenth Amendment, according to the American Civil Liberties Union of Pennsylvania.
The lawsuit was filed in July 2013 on behalf of 21 Pennsylvanians who wish to marry in the Keystone State or want the commonwealth to recognize their out-of-state marriages.
NBC10 has learned that people on both side of the issue received 24-hours advance notice that a decision has been made.
The ACLU announced plans for "Decision Day rallies" across the state Monday.
In Philadelphia, a rally will take place on the north side of City Hall beginning around 5 p.m. Tuesday.