The Constitutional Court in Romania gave validity to a proposal that would allow only heterosexual marriage in the country on July 21.
The proposal, which had three million signatures gathered by the Coalition for the Family, could be placed on a ballot as a referendum to be voted on, according to Reuters.
The Romanian constitution says family starts "on the basis of freely consenting marriage between spouses," but the proposal would replace "spouses" with "a man and a woman."
LGBT rights groups said if the proposal is passed, then it would effectively outlaw gay marriage in the country.
More than 20 human rights organizations called for the court to rule against the proposal, but the Liberty Counsel, a Christian law firm in the U.S., cheered the court's ruling and claimed some of the credit.
Mat Staver (pictured), who served as the lawyer for Roman County, Kentucky, clerk Kim Davis in her failed fight to deny marriage licenses to same-sex couples in 2015, founded the Liberty Counsel, according to the Human Rights Campaign.
The Liberty Counsel said in a July 21 press release that the court ruling was a "major victory for natural marriage and the right of Romanian citizens to determine their own destiny."
The Liberty Counsel said it "submitted a major brief in support of the referendum, pointing out the intrinsic and common-sense benefits of natural marriage, discussing the deleterious effects of same-sex 'marriage' in the handful of nations that have tried out this social experiment, and debunking the fraudulent Kinseyan 'research' that lies at the heart of the sexual revolution."
It is unclear how famous biologist Alfred Kinsey's research was "fraudulent," or what nations experienced "deleterious effects" after legalizing same-sex marriage.
The law firm said its "brief was instrumental in exposing and rebutting the misleading arguments and briefs submitted by a number of pro-homosexual organizations from outside of Romania, such as ILGA Europe and Amnesty International. Romania and other traditional nations in Europe have come under increasing foreign pressure to abandon their heritage, traditions and sovereignty in favor of the homosexual agenda pushed from abroad."