Markets either don't believe the White House attempts to force out the Federal Reserve chair will succeed, or they assume it's all bluster. But there's good reason to be wary of the sort of uncertainty that renewed Fed-bashing may be building under the surface.

President Donald Trump’s attacks on Federal Reserve Chair Jerome Powell are so commonplace at this point that they barely register in financial markets these days. The rapidly intensifying multi-pronged efforts by Trump’s advisers to amplify and expand on Trump’s attacks are a good reason to rethink that indifference.