Here's everything you need to know before Tuesday's opening bell:
Amazon and Starbucks will have to pay a new tax to help fund homeless services and affordable housing in Seattle.
MSCI will add the stocks of 234 China-based companies to its closely watched Emerging Market Index on June 1.
Vodafone CEO Vittorio Colao will step down in October after 10 years at the helm.
Investors will analyze earnings from Home Depot .
U.S. stock futures pointed lower ahead of another round of trade talks between the U.S. and China.
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