Here's everything you need to know before Tuesday's opening bell:  

  1. Donald Trump threatened to unleash a fresh round of tariffs on $200 billion worth of goods from China.
  2. The Trump administration has reportedly told Apple (AAPL - Get Report) that it wouldn't place tariffs on iPhones.
  3. The Senate approved a defense policy bill that blocks a White House plan to allow  ZTE Corp. (ZTCOY) to buy component parts from the U.S. 
  4. GameStop (GME - Get Report) jumped 9% following a report it might be selling itself off to a private-equity firm.
  5. U.S. stock futures plunged. 

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