Open: This is Face the Nation, May 26

The latest on the destruction in Oklahoma with Gov. Mary Fallin, plus storm aid, immigration and more with Sen. Tom Coburn, R-Okla., and Sen. Chuck Schumer, D-N.Y., and Harvard University's David Gergen and The Washington Post's Michael Gerson discuss recent Washington controversies. In page two, our panel of weather experts look at the possible role of global warming in recent extreme weather, and author Joseph Persico on his new book "Roosevelt's Centurions: FDR and the Commanders he led to Victory in WWII".