After opening at a new all time high on Sunday evening following Friday's record close, S&P futures drifted lower as fresh Sino-U.S. tensions over Hong Kong dented sentiment and renewed last minute disagreements threatened to torpedo Brexit negotiations, while investors also awaited concrete signs of progress on a coronavirus relief bill. Oil fell while the dollar rose.

Shares of U.S. banks including Morgan Stanley, Wells Fargo & Co, JPMorgan & Chase, Citigroup and Goldman Sachs fell between 0.4% and 1% in premarket trading. Intel dropped on a report that Apple Inc. is planning a series of new Mac processors aimed at outperforming Intel's fastest chips.