MISSION, Kan. (AP) — The American Civil Liberties Union is urging a Kansas school district to stop barring staff from wearing safety pins on their clothes in a sign of solidarity to the disenfranchised. The ACLU sent a letter Tuesday to the Shawnee Mission School District's superintendent about the pins, which have gained popularity in the U.S. following the election of Donald Trump. The pin is intended to show that the wearer is a safe person to turn to. The district said in a statement Monday that employees' communication inside the classroom "is considered speech on behalf of the school district." Doug Bonney, chief counsel for the ACLU's Kansas chapter, says litigation is "a very real probability" but that the organization wanted to give the district time to make a change first.