Grimm, under these conditions, found himself the subject of ridicule by the other students, and through his parent, sued the school board on grounds of
Title IX discrimination and the
Equal Protection Clause in June 2015 in the
United States District Court for the Eastern District of Virginia. Grimm obtained legal representation from the
American Civil Liberties Union and referred the case to the DOJ. The federal government agreed to intervene in the case on Grimm's behalf, writing to the court that Title IX "prohibits discrimination based on sex, including gender identity, transgender status, and nonconformity to sex stereotypes". In legal court proceedings, Grimm asserted he had been allowed to use the boys' bathroom for seven weeks without incident and had faced gender-based discrimination after the regulation of the Gloucester County School Board was implemented. Prior to the hearing, on December 18, 2014, the ACLU had already filed a complaint with the U.S. Department of Justice (DOJ), based on the nature of the school board's restroom policy. Despite Grimm's case mirroring similar cases that the OCR had been pursuing and the existing guidance from the Department of Education, Judge
Robert G. Doumar of the District Court dismissed the suit. In his ruling, Judge Doumar held that Title IX's operative provision should be read narrowly to cover discrimination on the basis of genetic "sex" only, and not gender identity or expression. Doumar also held that on the basis that under Title IX, the school had provided comparable facilities as directed under . The court also rejected Grimm's request for a preliminary injunction to use the boys' restroom while litigation proceeded. The school board moved for rehearing
en banc, but the Fourth Circuit declined to rehear the case. In June 2016, the District Court granted the preliminary injunction to allow Grimm to use the boys' restroom. The Gloucester County school board petitioned to the Supreme Court. The school board raised questions on the Auer deference that the Fourth Circuit had relied on in giving weight to the Department of Education's interpretation of Title IX and via the unpublished Ferg-Cadima letter, and to whether the Department of Education's interpretation of comparable facilities or that of had prevalence. The Supreme Court, in a 5–3 vote in August 2016, agreed to put a stay on the District Court's preliminary injunction, with Justice
Stephen Breyer joining the conservative sides as to "courtesy" to maintain the status quo while the Court decided if they would take the case. Subsequently, in October, the Court granted certification of the case, with the oral arguments later to have been heard on March 28, 2017. Shortly upon taking office in January 2017, President
Donald Trump took steps to reject past guidance set by the Obama administration related to transgender rights. On February 22, 2017, Trump and Education Secretary
Betsy DeVos formally reversed past Department of Education guidance including the Ferg-Cadima letter on claims the regulation was not based on a sound legal foundation, allowing schools to establish their own policies as necessary under Title IX. Lawyers in Grimm's case recognized this drastically affected the legal underpinning of the case though had expected to be able to still argue in Grimm's favor on other points, but on March 6, 2017, the Supreme Court vacated their case as a result of the change in the administration's policy, vacated the Fourth Circuit's prior ruling, and remanded the case back to the lower courts to be retried under the current interpretation of Title IX protections. ==Rehearings==