The American Civil Liberties Union of Nebraska is urging Omaha officials Tuesday to reject an extension of the city’s current state of emergency unless Mayor Jean Stothert commits to ending a ban on groups of more than 25 people. The group’s legal director, Adam Sipple, argues in a letter to city officials that the order violates protesters’ rights. Sipple says the Constitution does not allow the government to suppress legitimate First Amendment conduct as a preventative measure.