A federal court judge said Monday it was “highly unlikely” he would award a preliminary injunction that would allow a transgender Gloucester student to use the boys’ restroom when school resumes this fall.

The Gloucester High School student, 16-year-old Gavin Grimm, was born a female but identifies as a male. The ACLU filed a lawsuit on his behalf last month claiming that a county school board policy regarding restroom and locker room use violates Title IX and the Equal Protection Clause of the 14th Amendment.

U.S. District Court Judge Robert G. Doumar did not make a determination on the injunction request during a hearing Monday in Norfolk, but said he would file a written opinion.

The Gloucester School Board had sought to have the lawsuit dismissed Monday, but Doumar said he was going to let the case proceed. He did dismiss claims by the ACLU and the U.S. Justice Department that the policy violates Title IX, saying there is a specific grant in Title IX that allow...