Republican lawmakers prodded Federal Reserve Chairman Jerome Powell over growing inflation as he conceded that it has gotten higher than the central bank anticipated.

Powell testified before the Senate Banking Committee on Thursday and faced sharp questions about the Fed’s prediction that inflation is only transitory and will sink back down in the coming months and over the next year. Several lawmakers pointed out that the Fed’s previous projections have fallen short of actual levels of inflation, and in light of that, questioned the central bank’s reassurance on the matter.