"Between now and the (Nov. 3 presidential) election there will be a lot of uncertainty. You will see a lot of volatility, a lot of short-term trades," Stovall said.
Federal Reserve Chair Jerome Powell on Tuesday will make the first of three appearances on Capitol Hill this week to address lawmakers' questions and concerns about the raft of emergency measures the central bank has taken to help support the economy during the pandemic.
At 10:08 a.m. ET the Dow Jones Industrial Average was down 11.07 points, or 0.04%, at 27,136.63, the S&P 500 was up 8.47 points, or 0.26%, at 3,289.53, and the Nasdaq Composite was up 28.53 points, or 0.26%, at 10,807.33.