The Williams Institute estimates that 698,000 U.S. adults have received conversion therapy, including 350,000 who did so as adolescents. Chiles is represented by Alliance Defending Freedom (ADF), a conservative Christian legal powerhouse that has regularly emerged victorious before the Supreme Court, including in previous challenges to Colorado laws. Their challenge was supported by outside briefs from Christian counseling and medical groups, the U.S. Conference of Catholic Bishops, The Church of Jesus Christ of Latter-day Saints, Catholic University of America, the Becket Fund for Religious Liberty and 20 Republican state attorneys general.
The Trevor Project, PFLAG, the American Psychological Association, nearly 200 Democratic members of Congress and 20 Democratic state attorneys general urged the justices to side with Colorado.