Federal Reserve Chairman Jerome Powell is claiming the U.S. economy is strong but he's concerned about headwinds next year. Powell spoke in Dallas at a Q and A event. Powell said there are challenges, including slowing growth abroad, fading fiscal stimulus and the lagged effect of eight rate increases in the past three years. President Trump has been critical of Powell and the Fed for raising rates and has said they are slowing down the economy. Powell said they are committed to serving the public in a non-partisan, professional way. He did say they are looking carefully at what impact the rate increases are having on the economy.