Updated to include more earnings news.
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Here are five things you must know for Tuesday, Jan. 31:
1. -- U.S. stock futures pointed lower Tuesday on continued concerns over Donald Trump's travel ban, particularly after the president fired acting Attorney General Sally Yates on Monday for "refusing to enforce" the order.
Yates, a Democratic appointee, publicly questioned the constitutionality of Trump's controversial refugee and immigration ban and refused to defend it in court. Trump's executive order temporarily banned immigration from seven Muslim-majority countries, including Iran and Iraq.
The firing of Yates came hours after she directed Justice Department attorneys not to defend the executive order, saying she wasn't convinced it was lawful or consistent with the agency's obligation "to stand for what is right," the Associated Press reported.
Stocks in the U.S. and overseas took a blow Monday as chaos and confusion surrounded the White House immigration ban.
The S&P 500 fell 0.60%, and the Nasdaq declined 0.83%. The Dow Jones Industrial Average fell 0.61%, retreating to 130 points below 20,000. The blue-chip index had hit 20,000 for the first time last week. The Volatility Index, also known as the fear index, spiked in trading on Monday.
2. -- The Federal Reserve begins a two-day policy meeting on Tuesday, where it's widely expected the central bank will leave rates unchanged. Investors, however, will be listening Wednesday afternoon for clues as to the Fed's plans for the rest of 2017.
Economists vary on their forecasts for how many times the Fed will lift rates during the year. Some suggest three rate hikes, while others predict just one rate hike and not until June.
Meanwhile, the economic calendar in the U.S. on Tuesday includes the Employment Cost Index for the fourth quarter at 8:30 a.m. EST, the S&P Case Shiller Home Price Index for November at 9 a.m., Chicago PMI for January at 9:45 a.m., and Consumer Confidence for January at 10 a.m.
3. -- Aetna (AET) posted fourth-quarter operating earnings that were stronger than expected and said it's considering its legal options after a federal court blocked its $37 billion takeover of Humana (HUM - Get Report) .
Earnings are expected Tuesday from Apple (AAPL - Get Report) , Advanced Micro Devices (AMD - Get Report) , Sprint (S - Get Report) , MasterCard (MA - Get Report) , UPS (UPS - Get Report) and Exxon Mobil (XOM - Get Report) .
The retailer last May began testing a two-day shipping subscription service called ShippingPass that mirrored Amazon's successful Prime service. Members to ShippingPass received free, two-day shipping for $49 a year compared to $99 for the similar service at Amazon Prime.
The world's largest retailer also lowered the minimum purchase required for free shipping to home to $35 from $50.
"I couldn't be more excited. We are moving at the speed of a startup," said Marc Lore, the head of Walmart's U.S. e-commerce business. Lore joined Walmart in September after Walmart's $3 billion purchase of Jet.com closed. Lore was the founder of Jet.com.
5. -- Deutsche Bank (DB - Get Report) was fined £163 million ($203 million) by Britain's financial watchdog over so-called mirror trades that allowed customers to potentially launder money from Russia.
The penalty follows a similar levy by New York's Department of Financial Services, which fined Deutsche Bank $425 million on Monday for allowing some customers to buy stocks in Russia only to allow people linked to those customers sell the same stocks through Deutsche Bank's London office.
Deutsche Bank said the settlements will draw a line under investigations the investigations in London and New York and that the fines were "already materially reflected in existing litigation reserves."