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

  1. Trump tweeted that the U.S. was preparing "more than reciprocity" to trade partners that impose  "artificial" barriers to American companies.
  2.  Trump plans to bar many Chinese companies from investing in U.S. technology firms.
  3. GE (GE) is reportedly nearing a deal to sell a unit that makes large industrial engines to Advent International for $3 billion. 
  4. "Jurassic World: Fallen Kingdom" opened with $150 million in ticket sales in U.S. and Canada theaters. 
  5. U.S. stock futures fell.