While almost no one thinks Donald Trump's verbal attacks on Federal Reserve Chair Jerome Powell are a positive development, they have electrified the debate about whether the U.S. president is right that interest rates are too high.

Inflation is up, stocks are down, and more tariffs are on their way. Trump wants interest rates to come down but the direction of travel is making it less likely that the Fed will deliver the cuts he wants.

JPMorgan Chase CEO Jamie Dimon said on Tuesday the independence of the Federal Reserve is "absolutely critical".