When Russian hackers targeted the U.S. election infrastructure

Russian operatives launched a widespread cyberattack against state voting systems during the 2016 presidential election.

The U.S. intelligence community has concluded there is no doubt the Russians meddled in the 2016 U.S. presidential election, leaking stolen e-mails and inflaming tensions on social media. While Congress and special counsel Robert Mueller investigate Russian interference, including whether the campaign of Donald Trump colluded with Russia, we have been looking into another vector of the attack on American democracy: a sweeping cyber assault on state voting systems that U.S. intelligence tied to the Russian government. Tonight, you'll find out what happened from the frontline soldiers of a cyberwar that was fought largely out of public view, on digital battlegrounds in states throughout the country.