Tonight at 2:00 a.m., the interest rate decision is coming again—this will be Waller's second public appearance.

This time, the market’s disagreement on the direction of interest rates is far greater than in the previous FOMC meetings, when the outlook was almost unanimously unchanged. The probability of a 25bp hike is currently about 25%.

On one side are the Middle East situation again thrown into turmoil and the surge in oil prices; on the other are Trump’s public-opinion management and extreme pressure tactics. This time, what kind of answer will Mr. Waller give the market?