Here's everything you need to know before Friday's opening bell:
Donald Trump reportedly is set to impose tariffs on about $50 billion in imports from China.
AT&T closed its 85.4 billion purchase of Time Warner .
Chinese regulators have approved Qualcomm Inc.'s proposed $44 billion acquisition of NXP Semiconductors .
Facebook top policy and communications executive, Elliot Schrage, will leave after working at the company since May 2008.
U.S. stock futures tumbled.
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