The C.E.O. of JPMorgan Chase, who has rarely taken on President Trump during his second term, wades into the argument over the Federal Reserve chair.

JPMorgan Chase Chief Executive Jamie Dimon, the most influential banker in the U.S., said in a statement Tuesday that the country’s economy “remained resilient” during the second quarter. “The finalization of tax reform and potential deregulation are positive for the economic outlook,