From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.
AUDIE CORNISH, HOST:
And I'm Audie Cornish. The White House tried to clarify its message on Syria today, saying it is still studying evidence that the government there has used chemical weapons. Here's press secretary Jay Carney.
JAY CARNEY: We are continuing to work to build on the assessments made by the intelligence community. The degrees of confidence here are varying, this is not an airtight case.
And we're joined now by our Friday political observers, columnist E.J. Dionne of The Washington Post. Hey there, E.J.
E.J. DIONNE: Good to see you.
CORNISH: And David Brooks of the New York Times, good to see you.
DAVID BROOKS: Good to see you.
CORNISH: So we're going to go back to the news we heard at the top of the hour about Syria. We heard Tom Bowman talk about three U.S. options all having downsides. Here's President Obama on this topic today.
The U.S. Navy is planning to ramp up training activities off California and Hawaii. But that has rekindled a battle over Navy sonar, which is known to harm marine mammals. From member station KQED, Lauren Sommer reports.
LAUREN SOMMER, BYLINE: We humans are visual creatures and for good reason. If someone is far away, you can usually see them before you hear them. Underwater, it's the opposite.
BRANDON SOUTHALL: The physical environment of the ocean really favors the use of sound, and the animals have evolved accordingly.
From NPR News, this is ALL THINGS CONSIDERED. I'm Audie Cornish.
ROBERT SIEGEL, HOST:
And I'm Robert Siegel.
The surviving suspect in the Boston Marathon bombing was moved today to a prison hospital outside Boston. Officials say Dzhokhar Tsarnaev is no longer cooperating with investigators. Some members of Congress, meanwhile, say the FBI should have heeded Russian warnings that Dzhokhar's elder brother had become a follower of radical Islam.