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.

Hello, this is Colum Murphy in Beijing, where Donald Trump’s penchant for doing the surprising … well … surprised everyone again this week.

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