This what you need to know before the markets open:

1. Investors await Donald Trump's address to Congress. The speech comes after the President again touted forthcoming tax reform from his administration. 

2. Warren Buffett, in his annual letter to shareholders of Berkshire Hathaway (BRK.A - Get Report) , said he remains bullish on America's future, drawing optimism from U.S. history.

3. Shares of London Stock Exchange (LDNXF)  and Deutsche Boerse (DBOEY)  fell sharply Monday as the third attempt to combine the two stock exchange operators appeared close to collapse amid demands from competition authorities in the European Union.

4. Intesa Sanpaolo (ISNPY)  stock surged Monday after the lender walked away from a takeover of of the Mediterranean nation's largest insurer, Assicurazioni Generali  (ARZGY) .