The Last Word with Lawrence O'Donnell 05/05/17

Massive hack in French election, as US investigation heats up

The leading French presidential candidate's campaign is the target of a massive hacking on the eve of the vote. Plus, new revelations about Michael Flynn's Russia contacts as Sally Yates prepares to testify. Shawn Henry, David Corn & Matea Gold join Ari Melber. ... more Duration: {{video.duration.momentjs}}