Washington will turn into a virtual fortress ahead of Donald Trump’s presidential inauguration on Friday, as the U.S. capital braces for more than a quarter-million protesters expected during the Republican’s swearing-in. Police have forecast that some 900,000 people, both supporters and opponents, will flood Washington for the inauguration ceremony, which includes the swearing-in on the steps of the U.S. Capitol and a parade to the White House along streets thronged with onlookers.