"Yours, Professor Dumbledore?" said Umbridge, with a singularly unpleasant little laugh. "I'm afraid you do not understand the position. I have here-" she pulled a parchment scroll from within her robes "-an Order of Dismissal signed by myself and the Minister for Magic. Under the terms of Educational Decree Number Twenty-three, the High Inquisitor of Hogwarts has the power to inspect, place upon probation and sack any teacher she-that is to say, I-feel is not performing to the standards required by the Ministry of Magic. I have decided that Professor Trelawney is not up to scratch. I have dismissed her."