President of Earth (Return of the Klytode)

The President of Earth was the official for Earth in 4014. For a while he was under the influence of the Klytode and worked to have the Klytode Androids in position ready to destroy the Earth's weather control systems. Fortunately, the Doctor intervened and the President was released from the Klyton’s influence and took responsibility for its safety. (DWAM: Return of the Klytode)

Behind the Scenes
The President would seem to have a strong resemblance to Russell T Davies.