President Donald Trump says his economic policies have revived the auto industry and American manufacturing. His comments in the Detroit suburb of Milford on Monday came as many businesses there contend that sweeping tariffs he's imposed against Canada and the rest of the world have hurt Michigan. The Republican president watched General Motors vehicles compete in drag races and looked at other vehicles at a GM facility before he delivered a speech. His tariffs have affected many businesses in Michigan, where the economy relies heavily on trade with Canada.