Tennessee’s Republican lawmakers ended the legislative session early on Friday without taking action on gun control, less than a month after a mass shooter at a Nashville school killed three adults and three 9-year-olds. The state allows 90 days for legislative sessions over a two-year period, but lawmakers adjourned this year after just 27 days, even as thousands of students, parents, teachers, and others have decried the role that lax gun laws played in the shooting and called for reforms.