"...Many learned economists and policy experts ruefully acknowledge that the president’s intuition is broadly right: While labeling China a currency manipulator now would look ridiculous, the United States should have done it a long time ago.
“With the benefit of hindsight, China should have been named,” said Brad Setser, an expert on international economics and finance who worked in the Obama administration and is now at the Council on Foreign Relations....."
https://www.nytimes.com/2017/04/11/business/economy/trump-china-currency-manipulation-trade.html