Wall Street falls as investors wait for Fed statement

U.S. stocks pulled back on Tuesday from a rally in the previous session ahead of a Federal Reserve meeting that investors hope will bring insight on the timing of an interest rate hike. Investors held off on making big bets after the Federal Open Market Committee kicked off its meeting, which will be followed by a statement from Chair Janet Yellen Wednesday afternoon. Most economists expect the Fed to remove a pledge to be "patient" about raising interest rates from its statement, givi