The yen surged into the upper 139 range per dollar, its strongest level in about seven months. The move followed Trump's criticism of Fed Chair Powell and calls for rate cuts, which raised concerns about Fed independence.
Dollar weakness driven by Fed independence worries can lift dollar-priced commodities and lower import costs for Asian feed buyers. The effect on grain prices is indirect and modest.
Not enough comparable past events yet for a historical read.
After 1,637 past bearish macro events, US Dollar (Broad) moved a median -0.2% over 5 sessions (39% higher; middle half -0.6% to +0.3%), and -0.2% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.