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.

U.S. stock futures point to a lower open as investors brace for one of the busiest weeks of earnings season.

U.S. stocks are drifting at the start of a week with many potential flashpoints for markets including earnings reports and economic data