Indices landed in red territory on Monday. Stocks dipped on a variety of economic news. Early trade deal optimism faded as the session progressed. On another note, Tesla shed 3.20% today. CEO Elon Musk said the electric carmaker will unveil the Model Y SUV on March 14. In M&A action, Biogen will acquire gene therapy company Nightstar Therapeutics in a deal worth $877 million. Looking ahead, Salesforce.com is set to release fourth-quarter earnings after the closing bell.