who controls at least one house of the us congress. facebook has removed nearly three dozen accounts and pages. it has not publicly identified russia as behind this campaign. in a moment we will hear from our technology correspondent dave lee. but first, here is what the director of homeland security said about russia's role in the 2016 presidential election. our democracy itself is in the crosshairs. let me take just a moment to touch on this, because i think it's very important to do so. two years ago, as we all know, a foreign power launched a brazen, multifaceted influence campaign to undermine public faith in our democratic process and to distort our presidential election. that campaign was multifaceted. it involved cyber espionage, leaks of stolen data, cyber intrusions into voter registration systems,