Hello and welcome to bbc news. The boss of the fbi has hit back at donald trump in a row over the release of a secret republican memo, which accuses the agency of political bias against the president. In an e mail to staff, Christopher Wray said talk is cheap and that the bureau would continue to investigate independently and by the book. Democrats have said the release was another effort to undermine the inquiry into alleged collusion with russia. Our north america correspondent peter bowes reports. This is the memo that sank relations between the president and the fbi to a new low. The documents, written by republicans, makes the case that the Justice Department and the fbi showed bias against donald trump while spying on one of his advisers. A warrant for the surveillance operation was based on a dossier of information compiled by a former British Intelligence agent who was desperate to donald trump to lose the election. I think it is a disgrace what is happening in our country and