Trump is threatening 100% tariffs against a bloc of nine nations including Brazil, Russia, India, China and South Africa if they act to undermine the U.S. dollar.

Trump also said in his post that the countries "can go find another “sucker!” There is no chance that the BRICS will replace the U.S. Dollar in International Trade, and any Country that tries should wave goodbye to America.

While China could offset American tariffs by letting its currency fall, that might endanger Beijing’s recent efforts to stabilize the economy.