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 ends little changed before long weekend ReutersStock market today: Dow, S&P 500, Nasdaq slip, chip stocks rise as Wall Street ends volatile week lower Yahoo FinanceStocks Rise as Fresh Burst of Tech Momentum Builds: Markets Wrap Bloomberg.com