Robert Mueller isn't the only one hot on the trail of the Russians' election interference and Facebook manipulation.
Sen. Mark Warner (D-Va.), vice chair of the Intelligence Committee, tells us that based on witness testimony and documents that he has seen behind closed doors, the Russia probe is "the most important thing I will ever work on."
"I feel that more strongly today than even a year ago. And we don't even have near the tools that Robert Mueller has in his investigation."— Warner at an Axios News Shapers event on Thursday