Israeli Ambassador: Red line is to prevent war with Iran
from Anderson Cooper 360 by Ella Chick
Israeli Ambassador to the U.S. Michael Oren says the red line with Iran should be the last point at which we can act to stop them from getting a nuclear weapon. He identifies that as 20% enrichment, which means completing 90% of the bomb.

http://ac360.blogs.cnn.com/2012/09/27/i ... with-iran/