BISMARCK(AP) — North Dakota Gov. Doug Burgum signed a measure Friday aimed at shielding schools and teachers from lawsuits arising from posting the Ten Commandments in classrooms.

The Republican’s endorsement of the bill comes after attorneys and school officials warned the legislation is unconstitutional and would spur costly and unwinnable legal fights.

The bill received broad support in both Republican-led legislative chambers, with a 76-16 vote in the House and a 34-13 vote in the Senate. Hoping to fend off legal challenges, the House amended the bill with a requirement that the Ten Commandments be included in a display with other historical documents.

In a statement, Burgum said the bill “clarifies the existing authority in state law that allows a school to display a religious object or document of cultural, legal, or historical significance together with similar documents.”

“This law supports local control and gives school districts full control over whether to display any religious objects or documents,” his statement said.

The American Civil Liberties Union, which has been tracking the North Dakota legislation, has said that passage of the legislation would invite litigation. The organization said that not a single court has upheld the posting of the Ten Commandments in public schools, even if they are displayed with other material.

Proponents of the legislation said it is intended to promote moral behavior in schools, and that that the United States was founded on Ten Commandments’ principals.

Attorneys and education testified earlier that the bill likely violates the clause in the First Amendment of the U.S. Constitution that prohibits the establishment of religion by the government.