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.

Wall Street advanced on Friday, notching weekly gains as investors parsed a spate of earnings and looked for signs of easing tensions in the U.S.-China trade dispute.

Financial markets are likely to remain choppy until investors get more clarity on U.S. trade policy, Wall Street analysts say.