USA Policy has always been against settlement building in Jerusalem and the WB. However, since there have been no consequences to continued building, Israeli leaders can't claim to be "forced" into a pullout. If USA aid or loan guarantees had been truly contingent on a WB pullout, Israel would have long ago sighed in relief and cut a deal. US capitulation is harmful for Israel because it places the entire burden & blame for pullout on Israel and no Israeli leader will except this burden for all of eternity.
Shaffir to Herzog: Opposition failed to show leadership in political battles against PM (Haaretz)
from the article: EU, Obama: Settlement construction could threaten peace progress