This is what you need to know before the bell:
1. U.S. stock futures were slipping Tuesday as caution dominated trading ahead of the meeting later this week between Donald Trump and Xi Jinping of China. Trump's past comments have raised concern over the potential for conflict, though some analysts said they see room for compromise.
2. Chipmaker Qualcomm (QCOM - Get Report) said it would file a motion to dismiss a lawsuit by the Federal Trade Commission that accused the company of engaging in anticompetitive behavior to maintain dominance over the market.
4. When Verizon (VZ - Get Report) closes the $4.48 billion purchase of Yahoo!'s (YHOO) operating business, the telecommunications giant plans to rebrand the digital business containing the iconic Internet brand and AOL under the name Oath.
5. Boeing (BA - Get Report) signed a new, $3 billion deal with Iran's Aseman Airlines to supply 30 737 MAX aircraft to the carrier, a new agreement on top of the $16.6 billion sale it made in the Middle East nation following the nuclear deal reached between Iran and world powers.