Top UK diplomat reacts to new PM Theresa May’s first moves

Sir Peter Westmacott, the UK’s former Ambassador to the United States weighs in on the past three weeks’ fast-paced developments in Britain. Of the new prime minister, Theresa May, he describes her as grounded, no-nonsense and humble. He describes as a surprise her appointment of Boris Johnson, the pro-Brexit former mayor of London, to be foreign secretary. Gwen Ifill talks with Westmacott.