Pro-EU membership supporters hold European Union flags as they protest against Brexit across the street from the Houses of Parliament in London, Tuesday, Jan. 30, 2018. A leaked, and gloomy, economic forecast has inflamed arguments about Britain's decision to leave the European Union. Brexit-supporting politicians on Tuesday said those who released the document were trying to derail Britain’s EU exit, while pro-EU lawmakers accused the government of burying bad news. (AP Photo/Matt Dunham)