A national humanist group is threatening to sue Mississippi if the state does not provide alternatives to its recently introduced “In God We Trust” license plate.

The American Humanist Association, which includes atheists and agnostics, sent a letter on Thursday to Mississippi’s revenue commissioner and attorney general calling for a new license plate altogether or a viable alternative that does not cost an additional fee, according to The Associated Press.

Specialty plates that do not include the phrase are sold for an extra $30 per year.

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“Mississippi’s law violates the First Amendment rights of atheists in accordance with firmly settled Supreme Court precedent,” American Humanist Association's attorney Monica Miller said in a news release. “The Supreme Court has made clear that the state cannot force motorists to display an ideological message they deem unacceptable on their license plates.”

The new standard license plate will also include Mississippi’s state seal and the phrase "The Great Seal of the State of Mississippi."

The “In God We Trust” line is included in the state seal.

Mississippi Revenue Commissioner Herb Frierson told the AP Thursday he is having lawyers review the group’s request.