This is what you need to know before the markets open:
1. Donald Trump's national security adviser has quit. Michael Flynn resigned suddenly late Monday night. He apparently misled Vice President Mike Pence over conversations with Russia's ambassador by telling Pence he had not discussed sanctions on Russia in December.
2. Credit Suisse (CS) , the Swiss banking giant, posted a fourth-quarter loss of Sfr2.35 billion ($2.34 billion) after recording a settlement with the Department of Justice and said it was targeting job cuts in 2017 of between 5,500 and 6,500.
3. Toshiba (TOSYY) , the Japanese electronics and energy giant, said Tuesday that its chairman was resigning to take responsibility for problems that will result in a ¥713 billion ($6.3 billion) loss in its nuclear business.
4. A divided Senate late Monday approved Steven Mnuchin to serve as the Trump administration's Treasury secretary, in a move that came over Democratic objections to the ex-Goldman Sachs banker's views on tax reform and the post-crisis Dodd-Frank Act.
