Pro-Brexit demonstrators, calling on the British government to invoke article 50 immediately, and urging them not to hold a second referendum, shout slogans and hold placards as they protest outside the Houses of Parliament in London on September 5, 2016. 
Britain's Prime Minister Theresa May sought to drum up trade deals on Monday for a post-Brexit world, as she came under increasing pressure from all sides to define what that would look like. But whether Britain aims to retain access to the single market or not and how it plans to achieve its aim of curbing immigration from the rest of the EU remain open questions, as does the timing of exit. / AFP / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)