Prior to the end of the cold war there were numerous "non-member states" sitting on the cross-benches (North and South Korea being obvious ones). Once the cold war rivalries ended then all those states were A-OKed by the Security Council. So the only reason that "Palestine" will be sitting there is because of the USA's puppet-like deference to Israel, and to no other reason.
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Assailant attempts to shoot prominent Turkish journalist on trial for spying charges (Reuters)