The Supreme Court won't hear an atheist's latest challenge to the U.S. government's references to God.

The court on Monday refused to hear an appeal from Michael Newdow, who says government references to God are unconstitutional and infringe on his religious beliefs.

This appeal dealt with the inscription of the national motto "In God We Trust" on U.S. coins and currency. The 9th U.S. Circuit Court of Appeals in San Francisco says the phrase is ceremonial and patriotic and "has nothing whatsoever to do with the establishment of religion."

The court refused to hear Newdow's appeal of that decision.

"In God We Trust" was first put on U.S. coins in the 1860s and on paper currency in the 1950s.