WASHINGTON (AP) — President Donald Trump's nomination of Kevin Warsh to chair the Federal Reserve could bring about sweeping changes at a central bank that dominates the global economy and markets like no other. Warsh, if approved by the Senate, will be under close scrutiny from financial markets and Congress given his appointment by a president who has loudly demanded much lower rates than many economists think are justified by economic conditions. Whether he can maintain the Fed's long time independence ...