The head of St. Andrew’s Episcopal School—where President Donald Trump’s son Barron attends—joined dozens of other Maryland private schools in urging the president, Congress, and state policymakers to improve background checks, especially for automatic weapons and strengthen mental health measures.

And they don’t want to see the schools arm teachers with guns. The heads of school called that move—which has been embraced by Trump and U.S. Secretary of Education Betsy DeVos—"antithetical to our profession as educators,” wrote St. Andrew’s head, Robert Kosasky and more than 100 other heads of school in an open letter published as an advertisement in the Baltimore Sun this week. The letter is also slated to be published in the Washington Post this weekend.

President Trump and DeVos have said they would like to help interested states arm certain school personnel, particularly those with some sort of military or law enforcement training. DeVos has made it clear though, that no state or school should be mandated to arm its staff.

And she said in an interview with NBC’s Today Show that having an armed teacher in every classroom wouldn’t be appropriate.

Barron Trump, the president’s youngest son, enrolled in St. Andrew’s in Potomac, Md., at the beginning of this school year.

Photo: President Donald Trump, accompanied by first Lady Melania Trump, introduces their son Barron Trump from the Truman Balcony of the White House during the annual White House Easter Egg Roll on the South Lawn last month. Susan Walsh/AP