The president's latest attack comes as Powell is scheduled to deliver remarks at the Fed's annual conference in Jackson Hole, WY, on Friday.

Federal Reserve chair Jerome Powell is scheduled to speak at the central bank's annual Jackson Hole Symposium on Friday, an event that could be a major test of the stock market's post-"Liberation Day" rally.

The highlight of the Kansas City Fed’s Jackson Hole central bank symposium is the Federal Reserve chair’s speech on Friday. This year, the U.S. economy faces economic and political cross-currents as Jerome Powell addresses the gathering for the last time as head of the central bank.