LONDON (Reuters) - U.S. President Donald Trump wants to see a successful British exit from the European Union that Washington will support with a U.S.-UK free trade agreement, national security adviser John Bolton told British officials on Monday.As Britain prepares to leave the European Union on Oct. 31, its biggest geopolitical shift since World War Two, many diplomats expect London to become increasingly reliant on the United States.Bolton, in London for two days of talks with British..