http://www.knesset.gov.il/elections17/eng/law/BasicLawKnesset_eng.htm
Non-declaration
16. If the speaker of the Knesset has called upon its members to make their declarations of allegiance and a member has not done so, that member shall not enjoy the rights of membership as long as he has not made the declaration.
16A.
Non-declaration due to dual-citizenship (Amendment 22)
If a Knesset member holds an additional, non-Israeli citizenship, and the laws of the country whose citizenship he holds permit him to be released from such citizenship, he shall not declare allegiance until after he has done everything required on his part to be released from such citizenship, and he shall not enjoy the rights of a Knesset member until he makes his declaration.

This needs to be made an issue. We need to spread this around.
The answer:
American laws have been manipulated by, and for traitors.
There's no excuse for such insanity, but here is some of the history behind it.
Source
Interesting that Israel does the U.S. no such favors. The U.S. is the wimpy little sycophant that always talks about its 'special relationship' with Israel while Israel grimaces with contempt and treats it like shit. The U.S. is the beaten wife who bails her drunken, violent husband out of jail after he kicks her arse. The U.S. has Stockholm syndrome. America is Israel's bitch, and seems to love it.
This is a good case study of how the Israeli parasite went about attaching itself to the American host. In this case and others, first prominent Jews entrench themselves in powerful judiciary positions, and from there they consolidate Jewish power by tweeking the laws. Abe Fortas was a close personal friend of Lyndon Johnson, who loved Israel and replaced the Dimona-meddling, Fed-threatening JFK. The sixties under Johnson was one of the boom periods for the consolidation of Jewish power in America.
Fortas resigned in shame after doing a shady deal with another prominent Jew, Louis Wolfson.
Great info. Many thanks for posting it.
I don't think that they get pressured to drop their US (or other) citizenships, at all.
Feds Argue Return Law Makes Jews Flight Risk
Sholom Rubashkin, former Agriprocessors’ CEO: Deemed a flight risk and denied ball.
Best ruling I've seen in years! Maybe someone is waking up to the reality of the criminal enclave of ziostan.