From this State briefing the other day:

QUESTION:
How do you expect to have any credibility on this subject when you can’t even acknowledge that Israel has a nuclear weapons arsenal?

NED PRICE:
Again, I just don’t have anything to offer on this. We’d refer any questions to the Israeli government. As a practice when it comes to just about any country, certainly any partner, we don’t speak in detail to the capabilities, to the programs of partners around the world, just as we would expect they would not speak to ours.

QUESTION: You’re referring me to the Israeli Government about their own nuclear program?

QUESTION: (Off-mike.)

MR PRICE: That’s correct.

QUESTION: About their own nuclear program – you can’t acknowledge that Israel has a nuclear weapons program?