Conservative groups are suing the University of Minnesota, arguing that the school violated their free speech rights by moving a conservative speaker to its smaller St. Paul campus.
The lawsuit filed Tuesday asks a federal court to declare the groups' First Amendment rights were violated and seeks an unspecified amount of money.
Students for a Conservative Voice and Young America's Foundation invited conservative speaker Ben Shapiro to speak in February.
They wanted to hold the event in a 1,000-seat hall on the main Minneapolis campus. But university officials cited safety concerns and moved the event to a 400-seat ballroom in St. Paul.
The groups allege the university has a "Speech Suppression Policy."
Shapiro is a plaintiff in the lawsuit.
University officials say they are reviewing the lawsuit.