Investors have all eyes fixed on the Federal Reserve’s annual economic symposium in Jackson Hole, Wyo., as the Fed charts the future direction of the monetary policy in what could be a defining moment for the market’s summer story.

Powell is set to deliver what almost certainly will be his last keynote address at the central bank's annual conclave.

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.