of Jerusalem permitted to campaign in the election of 2006 as the Israeli Government at the time under PM Ariel Sharon, allowed these apparently Hamas affiliated politicians to participate in Palestinian elections and they won seats as Fatah lost the election, but President Abbas remained leader of the PA. If they weren't members of what's technically a terrorist organization, Hamas, which remains defiant and did not accept the Quartet's three conditions, they wouldn't be expelled? How this helps the situation by expelling them if they are not actively involved in terror would only add to the tension of the current proximity talks.
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from the article: Abbas: Israel must not expel Hamas politicians from Jerusalem