United Auto Workers President Shawn Fain has recently expressed the UAW’s readiness to “work with Trump on trade.” Teamsters President Sean O’Brien spoke on a podcast against “illegal immigrants that come into our country to commit crimes and steal jobs.” But based on my experience, in the long run, international solidarity is the only way we can build working-class power. Demagogues like Trump have often exploited the protectionist and anti-immigrant sentiments that have been widespread in American labor for generations. A working class that is divided, both within the U.S.