- Michael Flynn's resignation is another moment of vulnerability for the new president, whose praise for Putin's Russia has put him at odds with the GOP majority on Capitol Hill, writes Julian Zelizer
- Zelizer says it could fuel investigations of the role of Russia in the election
Julian Zelizer is a professor of history and public affairs at Princeton University and a New America fellow. He is the author of "Jimmy Carter" and "The Fierce Urgency of Now: Lyndon Johnson, Congress, and the Battle for the Great Society." He also is the co-host of the podcast "Politics & Polls." The opinions expressed in this commentary are his own. This article has been updated with recent news developments.
(CNN)Michael T. Flynn's resignation is the second major blow to the Trump administration within the span of a week.