In a White House marked by infighting, top economic aide Gary Cohn, a Democrat and former Goldman Sachs banker, is muscling aside some of President Donald Trump's hard-right advisers to push more moderate, business-friendly economic policies. Cohn, 56, did not work on Republican Trump's campaign and only got to know him after the November election, but he has emerged as one of the administration's most powerful players in an ascent that rankles conservatives. Trump refers to his director of the National Economic Council (NEC), as "one of my geniuses," according to one source close to Cohn. More than half a...