The White House has the legal authority to ban specific news organizations

From the articleTrump says he's banning CNN, Politico and MS NOW from the White HouseAlso in Trump says he’s ‘banning’ CNN, MS NOW and Politico from the White House | CNN Business, Trump says he is banning CNN, MSNOW and Politico from the White House, Trump Says He’s Banning CNN, MS NOW, Politico Journalists From White House