The city of Houston has issued subpoenas demanding a group of pastors turn over any sermons dealing with homosexuality, gender identity or Annise Parker, the city's first openly lesbian mayor. And those ministers who fail to comply could be held in contempt of court.

"The city's subpoena of sermons and other pastoral communications is both needless and unprecedented," Alliance Defending Freedom attorney Christina Holcomb said in a statement. "The city council and its attorneys are engaging in an inquisition designed to stifle any critique of its actions."

ADF, a nationally-known law firm specializing in religious liberty cases, is representing five Houston pastors.