He can do what George Bush Snr came within a hair's breadth of doing: he can stand up and declare that it is US policy that all Israeli settlements beyond the Green Line are illegal under int'l law. Not just "illegitimate" (that anchors the fight over them in the diplomatic arena) but "illegal" (which is a whole different matter). Do it, Obama. Do it if only to watch the smirk suddenly vanish from Netanuahu's smug face.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: ANALYSIS / Netanyahu senses Obama's weakness on Jerusalem