Goldman Sachs thinks the Dollar might be in a for big surprise. On top of his grumbling about the Fed not lowering rates quickly enough, President Trump has been tweeting about the unfair advantage that other countries have in lowering their value against the Dollar. Trump apparently wants a weak Dollar to help the US compete more effectively in the global economy. Accordingly, Goldman Sachs think there is a good chance that Trump uses some special tool to intervene and weaken the currency, such as through the Treasury department.
FINSUM: This is not as unprecedented as it sounds. Even Powell has said the Treasury is the traditional power in charge of exchange rate policy. This would likely have a big impact on markets.