Stock market today: Dow, S&P 500, Nasdaq slip amid Warsh hearing, Apple CEO change, Iran uncertainty Yahoo FinanceStocks fall as oil jumps on fear Iran negotiations breaking down: Live updates CNBCStocks slip and oil prices rise as ceasefire talks between the U.S. and Iran look uncertain AP NewsWall Street’s rally fades as Middle East angst overshadows earnings optimism ReutersStock Market Today: Dow falls 150 points, S&P 500 and Nasdaq edge lower as the next round of U.S.-Iran talks in doubt ahead of cease-fire deadline; Fed chair nominee Kevin Warsh testifies in front of Senate MarketWatch