LONDON- Foreign minister Boris Johnson has arrived in the United States to meet close advisers to President-elect Donald Trump and senior Congressional leaders, Britain's foreign ministry said on Sunday. 'Following the successful meeting last month between the prime minister's chiefs of staff and President-elect Donald Trump's team, Foreign Secretary Boris Johnson is undertaking a short visit to the US for meetings with close advisers to the president-elect and senior Congressional leaders,' a spokesman for the ministry said in a statement. 'The discussions will be focused on UK-US relations and other foreign policy matters.'