Voters in counties won by President Trump are more exposed to retaliatory tariffs than those in counties won by Hillary Clinton, according to an analysis published last week by the Brookings Institution. China, the European Union, Canada and Mexico have imposed retaliatory tariffs on over $120 billion worth of U.S. exports, which represents 6.1 percent of the $2 trillion in total U.S. goods and services exported in 2017, the report notes. The largest share of retaliatory tariffs are China's, accounting...