President Trump’s aggressive trade policies could punish his most committed supporters, according to an updated analysis from the Brookings Institution.

The centrist, Washington-based think tank projects that more than 1 million jobs in over 2,600 counties across America that voted for Trump in 2016 could suffer in a trade war with China that began in earnest on Friday. Nearly 564,000 jobs in just under 500 counties that supported Democrat Hillary Clinton two years ago are threatened.