President Donald Trump's policies could cost the U.S. economy $90 billion this year in lost tourism and export revenue, according to analysts at Goldman Sachs. Many foreign visitors are avoiding the U.S. over concerns about increased hostility at the border, including reports about European tourists being detained for weeks in U.S. immigration centers. Others are angry about Trump's trade wars and his treatment of U.S. allies"particularly Canada"and are boycotting U.S. travel and products.