By Anne Kauranen and Howard SchneiderHELSINKI (Reuters) -U.S. Federal Reserve vice chair Philip Jefferson, a potentially pivotal figure in President Donald Trump’s effort to appoint a majority of the Fed’s 7-member Board of Governors, said on Tuesday he has not yet considered whether to keep his board seat after his vice chair term ends in September 2027. Separate from his 4-year stint as vice chair, Jefferson holds a board seat with a term that runs until 2036, well after Trump’s term ends following the 2028 presidential election. Rebuffed by federal judges so far, Cook’s firing is pending before the U.S. Supreme Court. TRUMP COULD WAIT AS LATE AS 2028 TO GET A FED MAJORITYThree of the seven current governors were appointed by Trump either in his first or current term. That is when Powell’s term as a governor expires, though his term as chair ends in May.