I decided to write this essay to establish an open and frank dialogue with the president of the United States. Over decades of negotiation, first as a union leader and later as president, I have learned to listen to all sides and to take into account all the interests at stake. That is why I have carefully examined the arguments that have been put forward by the Trump administration to impose a 50 percent tariff on Brazilian products. Bringing American jobs back and reindustrialization are...