Dramatic Snowden:

“The Obama administration has now adopted the strategy of using citizenship as a weapon. Although I am convicted of nothing, it has unilaterally revoked my passport, leaving me a stateless person.”

“As is routine and consistent with US regulations, persons with felony arrest warrants are subject to having their passport revoked,” said [State Department spokeswoman Jen] Psaki. “Such a revocation does not affect citizenship status.”
http://thehill.com/blogs/blog-briefing-room/news/307253-report-snowdens-us-passport-revoked#ixzz2YIsCUhcq