Kevin Warsh, whose broad criticism of current US Federal Reserve officials, playbook for rate cuts and ties to President Donald Trump elevated him past other contenders to lead the central bank, was sworn in as Fed leader on Friday at a pivotal moment for monetary policy and the American economy. Warsh, wearing a dark suit and tie and accompanied by his wife, Jane Lauder, heiress to the Estee Lauder fortune, was sworn in by Supreme Court Justice Clarence Thomas after a lengthy introduction by...