Russia interfered in the 2016 presidential elections and helped President Donald Trump win. We look back at history and ask: will they do it again?

Social-media posts spread discord and lies to more than 100 million people. Sophisticated hackers stole a candidate's email and political strategy, then revealed them to the world.

These were among the tactics the Russian government and firms tied to the Kremlin used to in what federal investigators determined was a "sweeping and systematic" effort to undermine Americans' confidence in their democracy and help Donald Trump win the presidency in 2016.

The man who ran that probe, Robert Mueller, sounded an alarm this week that Russia shows little sign of stopping.

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