Second Quarter Begins, Stocks Tumbling, Treasury Secretary LIVE, Citi CEO on the Outbreak

Carl Quintanilla, Jim Cramer and David Faber discuss the tumble in stocks to kick off a new month and quarter. President Trump warning the U.S. should prepare for a quote "very, very painful two weeks," from the rampant coronavirus. The White House is now projecting between 100,000 and 240,000 deaths associated with the virus. Treasury Secretary Mnuchin joins the "Squawk on the Street" gang, saying he's part of ongoing discussions with congressional lawmakers about a potential infrastructure bill. Plus, the CEO of Citi on how coronavirus is impacting his business, as 80% of his workforce is working from home.