Here's everything you need to know before Tuesday's opening bell:
Donald Trump threatened to unleash a fresh round of tariffs on $200 billion worth of goods from China.
The Trump administration has reportedly told Apple that it wouldn't place tariffs on iPhones.
The Senate approved a defense policy bill that blocks a White House plan to allow ZTE Corp. to buy component parts from the U.S.
GameStop jumped 9% following a report it might be selling itself off to a private-equity firm.
U.S. stock futures plunged.
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