First Republic Bank news and Fed meeting keep Wall Street flat.

Stock futures for the Dow Jones, S&P 500, and Nasdaq-100 slipped 0.1% each as investors prepare for the Federal Reserve's May policy meeting. Treasury Secretary Janet Yellen warned that the US may run out of measures to pay its debts as early as June 1. Chegg shares plummeted over 36% in extended trading after issuing weak guidance on second-quarter revenue. Companies such as Uber, Pfizer, and Molson Coors are set to report earnings before the bell, followed by Ford, Starbucks, Advanced Micro Devices, and Caesars Entertainment after the market closes.