S&P 500 futures are little changed ahead of the Federal Reserve's monetary policy announcement later today. The Fed is widely expected to leave interest rates unchanged, but traders will scrutinize the accompanying statement and new Chair Kevin Warsh's post-meeting comments for clues on the rate outlook. Lingering uncertainty about the preliminary U.S.-Iran deal is also keeping some on the sidelines, with President Trump warning the U.S. would resume bombing if terms are unsatisfactory. In economic data, retail sales rose 0.9 percent in May, well above the 0.5 percent forecast, following a downwardly revised 0.4 percent gain in April. Crude oil futures are up 58 cents to $76.63 a barrel after Tuesday's sharp drop, while gold is down $10.60 to $4,343.80 an ounce.