Keir Starmer said he would step down as Britain’s prime minister. Speaking outside Number 10, he said he would step down first as Labour leader, with nominations for a contest for a new leader of the party opening on July 9 and completed by Sept. 1. Bloomberg's Ruth David reports. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.