BOISE, Idaho (AP) — A recently passed Idaho law banning transgender women from competing in women's sports — the first such law in the nation — received backing on Friday from the administration of President Donald Trump.

The support came in the form of a court filing submitted by the U.S. Department of Justice, saying a federal judge considering a lawsuit challenging the ban should conclude that the law does not violate the U.S. Constitution.

The ban prohibits transgender students who identify as female from playing on female teams sponsored by public schools, colleges and universities. The b...