Sen. Mark Warner, ranking Democrat on a Senate panel probing Russian interference in 2016 election, says he expects Twitter representatives to testify soon (Byron Tau/Wall Street Journal)

Sen. Mark Warner, ranking Democrat on a Senate panel probing Russian interference in 2016 election, says he expects Twitter representatives to testify soon (Byron Tau/Wall Street Journal)

Byron Tau / Wall Street Journal:
Sen. Mark Warner, ranking Democrat on a Senate panel probing Russian interference in 2016 election, says he expects Twitter representatives to testify soon  —  Senate committee's probe is looking into improper use of social media to influence U.S. election  —  WASHINGTON—The top Democrat …

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