Traders on the floor of the New York Stock Exchange.Source: The New York Stock ExchangeStock futures were lower in overnight trading on Thursday after Treasury Secretary Janet Yellen said a large Covid relief package is still needed for a full recovery in the U.S.Futures on the Dow Jones Industrial Average slipped 94 points. S&P 500 futures and Nasdaq 100 futures both traded lower.Yellen told CNBC Thursday after the bell that more stimulus is necessary even as some economic data suggested a swift rebound. She added a $1.9 trillion stimulus deal could help the U.S. get back to full …
