In a Tuesday memorandum to employees, Walmart Chief Executive Officer (CEO) Doug McMillon declared that Walmart, the huge retailer that is among the 50 largest public companies in the world, would be ending some gun and ammunition sales and making other changes to gun policies in its stores. McMillon, in his memo, also says he would be writing that day to United States President Donald Trump and Congress leaders calling for action on several restrictions on the exercise of gun-related rights. McMillon calls these restrictions “common sense measures.”