Every one in American admin know that Bibi is a shrewd politician and he is not trustworthy. Every new Israeli Govt want to start negotiation from a different point. Each time the land which they are ready to give up get reduced. No one is brave enough in Israeli side to go back to 1967 borders.
U.S. defense chief tells Congress: Military options remain against Iran (DPA)
from the article: Will they miss again?