TOPSHOT - A demonstrator holds a sign that reads "Brexit. Is it worth it?" whilst draped in European Union (EU) and Union flags, as he protests outside the Houses of Parliament in central London on September 10, 2018. - Britain's former foreign secretary Boris Johnson launched another broadside against Prime Minister Theresa May on Monday amid rumours that he is preparing a leadership bid as Brexit tensions divide their party. Rumours about the former foreign minister's marital infidelities also swirled, with his allies accusing government officials of leaking information to undermine Johnson's chances. (Photo by Daniel LEAL-OLIVAS / AFP)