One of Donald Trump's key economic advisers has resigned from his position in the administration, prompting fears of a growing rift over trade barriers.
Gary Cohn, an advocate of free trade, is reportedly leaving over a dispute with the President regarding steel and aluminium tariffs.
He will depart in the coming weeks.
Trump said of Cohn that he had helped "to deliver historic tax cuts and reforms and unleashing the American economy once again".
He tweeted that a decision on a replacement would be made soon.
Will be making a decision soon on the appointment of new Chief Economic Advisor. Many people wanting the job - will choose wisely!— Donald J. Trump (@realDonaldTrump) March 7, 2018
Cohn joins a chorus of voices raising concerns over Trump's trade barrier plans, which so far include Prime Minister Theresa May, Goldman Sachs, and the European Union, which is plotting a possible retaliation.
Global fears of a trade war have impacted the markets over the last few days, especially in Asia where the Nikkei hit a five-month low