The president's chief economic adviser is the latest in a string of high-profiled staffers to leave the the Trump administration.
Gary Cohn played a key role in drafting and passing the tax reform bill, but he opposed President Trump's surprise plan for placing large tariffs on imported steel and aluminum.
Cohn is a former top executive at Goldman Sachs and was seen as a bridge from the White House to wall street and global financial decision makers.
In a statement, the president said Cohn did a "superb job in driving our agenda" and is a "rare talent."
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