U.S. Senator Martin Heinrich and other members of Congress previously sent a letter to the U.S. Interior Department demanding answers about the removal of exhibits and signage.

The stamps — complete with pinstriping — were unveiled Friday during a celebration in San Diego.

Federal law already prohibits the deployment of armed federal forces to election locations unless “necessary to repel armed enemies of the United States,” but Democratic lawmakers, election officials and governors remain concerned.

The office of state Attorney General Raúl Torrez announced that the search was being done with the cooperation of the current ranch owners.