The American Civil Liberties Union of Utah has announced it will file a lawsuit challenging Utah's refusal to recognize the marriages of gay couples.

News of the lawsuit comes a day after Governor Gary Herbert announced that the state would not recognize the more than 1,300 marriage licenses it issued during the 17 day window bookended by a federal judge's ruling striking down Utah's marriage ban and the Supreme Court putting the judge's order on hold pending the outcome of an appeal.

The ACLU said it had been “overwhelmed” with couples wanting to be a part of the suit.

“We have a great pool and we are working through that, and plan to bring litigation that will protect all marriages, whether the couples are named plaintiffs or not,” the ACLU said in a statement.

Also on Thursday, the Human Rights Campaign (HRC), the nation's largest LGBT rights advocate, called on the federal government and the 17 states where gay nuptials are legal to recognize the Utah marriages.

“There is no legal reason to question the validity of these more than 1,300 marriages,” HRC President Chad Griffin wrote in letters addressed to Attorney General Eric Holder and state attorneys general. “Each was legally performed by a clerk representing the state of Utah, in accordance with the state's statutes and constitution.”