Wall Street drifted modestly lower before the opening bell as uncertainty over global trade seeps into the busiest week of earnings this quarter from major corporations, as well as a raft of economic indicators Futures for the S&P 500 dropped 0.

The S&P 500 and the Dow inched higher in choppy trading on Monday as investors braced for a week packed with key economic data and earnings from some of Wall Street's biggest companies, while U.S. trade policy developments remained in focus.