MARGARET BRENNAN, CBS NEWS: So, how do you clear the air? Are you going to apologize for this letter?
SECRETARY OF STATE JOHN KERRY: Not on your life. I'm not going to apologize for the -- for an unconstitutional and unthought-out action by somebody who has been in the United States Senate for 60-some days.
That's just inappropriate. I will explain very clearly that Congress does not have the right to change an executive agreement. Another president may have a different view about it. But, if we do our job correctly, all of these nations, they all have an interest in making sure this is in fact a proven peaceful program.
And it would be derelict if we allow some gaping hole in this program that doesn't do so. But let's see what it is first. And I think this applies to everybody, incidentally, who has been trying to judge this before, in fact, the deal, if it can be sealed, is sealed.