Summary: Here's everything you need to know before Tuesday's opening bell: Starbucks will close 8,000 stores for 4 hours Tuesday for anti-bias training. Chinese authorities were set to approve Qualcomm's planned $44 billion acquisition of NXP Semiconductors . Software company Verint Systems is in talks to buy NSO Group, an Israeli maker of cybersurveillance products Box office sales for "Solo: A Star Wars Story" came in well below expectations at $83.3 million U.S. stock futures pointed lower as European stocks tumbled amid political crisis in Italy
