Trump conceded in one interview that he would have to work with states to make it happen.

The two federal laws limiting firearms on school property are the Gun-Free School Zones Act of 1990, which prohibits anyone from knowingly bringing a firearm on or within 1,000 feet of a school, and the Gun-Free Schools Act of 1994, which requires at least a year’s expulsion for students who bring firearms to school.

Cottrol said the school zones act does give states “some ability to authorize individuals to possess firearms on school grounds. So while the president can’t directly do anything he could encourage states to change their laws.”

Arizona law requires that school districts enact policy requiring specific permission from a school administrator to bring a gun on campus. This lets schools have armed school resource officers, security guards, rifle clubs or educational programs about firearms and firearm safety.

The Arizona Department of Education does not have an official stance on firearms in schools, said spokesman Charles Tack. He said in an email that Superintendent Diane Douglas “is a firm believer in local control and would support allowing schools to make their own decisions on how best to ensure the safety of their students and staff.”