Why Wall Street is so fixated on Gary Cohn's position in the White House

Markets tumbled on Thursday after rumors swirled that Gary Cohn, President Donald Trump's top economic adviser and formerly Goldman Sach's number two, was resigning.
The S&P 500 slumped at around 10 a.m. ET, after the rumors began swirling on Twitter. Gold, a traditional safe haven trade, climbed as investors pulled into safety assets.The White House denied this was happening, and Cohn (as of the time this post was written) was still in. Still, Wall Street's jitteriness reflects fears t