In this Oct. 1, 2015 file photo in Austin, Texas, protestors gather on the West Mall of the University of Texas campus to oppose a new state law that expands the rights of concealed handgun license holders to carry their weapons on public college campuses and as of Aug. 1, 2016, they can carry in campus buildings. Texas' new law allowing concealed handguns in college classrooms, buildings and dorms has barely started and already faces a legal challenge seeking to block it before students return for the fall semester. Three professors at the university sued July 6, 2016 to overturn the law, claiming it is unconstitutional and is forcing colleges to impose "dangerously-experimental gun policies." The 50,000-student Austin campus has been a flashpoint of opposition to the law among faculty and students. (Ralph Barrera/Austin American-Statesman via AP, File)