The US has never recognized the West Bank or eastern Jerusalem as sovereign Arab territory, having declined to recognize Trans-Jordan's illegal 1952 annexation of this land. The US also does not recognize this territory as part of a "Palestinian State". Therefore, no one has standing under US laws to claim it is illegally occupied by Israel for the purpose of the anti-terrorism law, and the US charities that fund Jewish homebuilding there are not designated terrorist organizations under the law, as is Hamas. That's why. On the other hand, the Obama regime was required by US law to block IHH fundraising for Hamas as soon as he was aware of it, which WikiLeaks show he was in 2009. Obama's failure to act clearly violated US law.
Fabius, visiting Tehran, invites Rohani to France (Reuters)
from the article: Israel asks U.S. to ban Turkish charity behind Gaza flotilla