Stock futures were lower in early morning trading on Tuesday, turning negative after a positive start earlier. It follows a steep sell-off on Wall Street overnight.

The market’s September sell-off intensified on Monday with the Dow dropping 500 points, suffering its worst day since Sept. 8. The S&P 500 lost 1.2%, posting its first four-day losing streak since February. The Nasdaq Composite dipped just 0.1% after a late-day comeback rally.

Shares of Tesla dropped nearly 6% in overnight trading after CEO Elon Musk said in a tweet that the electric car-maker’s “Battery Day” event would not reach “serious high-volume production” until 2022, which disappointed investors and analysts.

Investors grew more anxious about the pandemic as the U.K. is reportedly considering another national lockdown as daily new infections rise. Meanwhile, prospects of further U.S. coronavirus fiscal stimulus became bleaker as lawmakers brace for a Supreme Court confirmation fight as President Donald Trump rushes to nominate a successor to Justice Ruth Bader Ginsburg, who died on Friday.

The major averages are on pace for steep losses for September, a typical weak month for stocks. All three major averages had just suffered three straight weeks of losses. The Dow and the S&P 500 have fallen 4.5% and 6.3% this month, respectively, while the Nasdaq has dropped 8.4% as investors dumped high-flying tech giants.

On Tuesday, investors will monitor a hearing with U.S. Treasury Secretary Steven Mnuchin and Federal Reserve chair Jerome Powell in front of the House Financial Services Committee about pandemic responses.

On earnings front, Nike will report its fiscal first-quarter results after the bell on Tuesday.

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