By Trevor Hunnicutt and Andrea Shalal WASHINGTON, Feb 3 (Reuters) – Federal Reserve Governor ‌Stephen ​Miran resigned on Tuesday from his ‌position as chair of the White House’s Council of Economic Advisers, fulfilling a pledge he ​made to the Senate as his assignment at the central bank becomes longer-lasting. Miran had been on unpaid leave from his CEA post since ‍President Donald Trump appointed him last ​year to fill an unexpected vacancy on the Fed’s Board of Governors to a term that expired January 31. The arrangement ​drew the ire ⁠of Democratic Senators who said it would make a presidential puppet of the Fed’s newest policymaker. Miran said he had been legally advised there was no need to quit his CEA post as the Fed job was only for a few months.  “I promised the Senate that if I should stay on the Board past January, I would formally depart the Council,” ‌Miran said in his resignation letter dated Tuesday and reviewed by Reuters. “I believe it is important to stay ​true to ‌my word …