On Thursday, President Trump enthusiastically backed the idea of arming certain teachers in each school as a way of preventing school shootings. On Twitter and in a meeting with law enforcement, state, and local officials, Trump argued that if 10 to 40 percent of American teachers carried a weapon in school, it would "solve the problem instantly," adding, "We have to harden our schools, not soften them." As an incentive for teachers, "you give them a little bit of a bonus, so practically for free you have now made the school into a hardened target," Trump said, echoing language used by the NRA, which has advocated arming teachers since the 2012 Sandy Hook Elementary School massacre.