Uncertainty over next Fed chair weighs on US stocks and bonds news.cgtn.comS&P 500 closes little changed Friday, posts weekly loss amid raft of Trump comments: Live updates CNBCWall Street: S&P 500 ends modestly lower, Warsh takes Fed pole position AFRWall Street slips on Fed uncertainty as markets brace for Davos signals SharecafeDow Jones edges lower, Russell 2000 at record high ahead of holiday-shortened week Proactive financial news