U.S. stock index futures surged late Monday as the Senate continued work to hammer out a compromise coronavirus-aid bill, suggesting gains when the markets opens Tuesday. Dow Jones Industrial Average futures YM00, +0.15% were up more than 700 points, or 3.9%, as of 11 p.m. Eastern. S&P 500 futures ES00, +0.20% and Nasdaq-100 futures NQ00, +0.27% also rose nearly 4%. Earlier Monday, stock markets ended with sharp losses as the rapidly rising number of coronavirus cases across the country overshadowed the Federal Reserve's pledge to buy unlimited bonds and bolster emergency lending facilities to support the flow of credit into the economy. The Dow DJIA, -1.84% closed at its lowest level since Nov. 9, 2016, the day of President Donald Trump's election.