President-elect Trump on Saturday threatened to impose 100% tariffs against emerging markets that try to shift away from the U.S. dollar in international trade. Why it matters: The threat against the BRICS nations (primarily Brazil, Russia, India, China, and South Africa) is the latest escalation in Trump's campaign to use the specter of tariffs to achieve policy goals. Catch up quick: Trump, in a Truth Social post Saturday, demanded the BRICS countries fully support the dollar and not create their own competing currency. If not, he said, "they will face 100% Tariffs, and should expect to say goodbye to selling...