Family Research Council President Tony Perkins is criticizing a ruling by a New York judge that says non-monogamous relationships should be treated equally to legal marriages.
In a commentary for The Washington Stand, Perkins said the ruling is part of a "slippery slope."
"The media laughed off the conservative movement's concerns about the slippery slope when Democrats pushed to sexualize the military 20 years ago," Perkins wrote.
"Now, almost two decades later, with American parents in the fight of their lives over transgenderism and judges paving the way for 'plural marriage,' it, unfortunately, proves we were right."
According to The Christian Post, in September, New York City Civil Court Judge Karen May Bacdayan ruled in the case of West 49th St., LLC v O'Neill that "the time has arrived" for legal recognition to be granted to non-monogamous relationships.
Bacdayan added that while the U.S. Supreme Court's decision to legalize same-sex marriage was "revolutionary," it "still adhered to the majoritarian, societal view that only two people can have a family-like relationship."
"Why then, except for the very real possibility of implicit majoritarian animus, is the limitation of two persons inserted into the definition of a family-like relationship for the purposes of receiving the same protections from eviction accorded to legally formalized or blood relationships?" Bacdayan wrote in her decision.
Perkins is one of many critics who said they are worried about how legalizing same-sex marriage will change federal laws.
In his dissent on the 2015 ruling on same-sex marriage, Chief Justice John Roberts argued that the same reasoning used in the majority opinion to legalize gay marriage could be used to support "a fundamental right to plural marriage."
"If a same-sex couple has the constitutional right to marry because their children would otherwise 'suffer the stigma of knowing their families are somehow lesser'… why wouldn't the same reasoning apply to a family of three or more persons raising children?" Roberts wrote.
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Amanda Casanova is a writer living in Dallas, Texas. She has covered news for ChristianHeadlines.com since 2014. She has also contributed to The Houston Chronicle, U.S. News and World Report and IBelieve.com. She blogs at The Migraine Runner.