Shares of Facebook Inc. FB, -0.20% and Google-parent Alphabet Inc. GOOGL, +0.14% swung to losses in premarket trading Wednesday, after President Trump suggested in an interview on Fox Business that the U.S. government was considering antitrust suits against the companies. Facebook's stock fell 0.4% and Alphabet shares slipped 0.2% ahead of the open. Just before Trump's comments, shares of Facebook and Alphabet shares were both up 0.9%. The stocks' premarket reversals comes as the futures ymu9 for the Dow Jones Industrial Average DJIA, -0.27% rose 73 points.