Yes, he said that yesterday:

Obama said that already "terrorist networks such as Al-Qaeda have tried to acquire the material for a nuclear weapon." He called on countries to adopt a "concrete" plan to secure nuclear materials within four years.

Brennan has added that AQ wants nukes but doesn't have the ability to use them. Well, they will overcome it. In the meantime, they use suicide bombers with home-made devices.

You know, what really surprises me? That everyone seems so worried now that terrorists can acquire nuclear material. They have been trying to do so for many years now, but now every damned politician in the world (including Zapatero) is very worried about that. Russian "Black Widows" have killed a handful of people not long ago and they didn't have nuclear weapons.

So, do they know something that we don't?