Up until the convening of the Arab League summit in the Moroccan capital, Rabat, in October 1974, the Hashemite Kingdom of Jordan was the official representative of Palestinians. After all, Jordan was home to most Palestinians before 1967, and the West Bank (including east Jerusalem) was part of the kingdom from 1952-1967. Palestinians living on both sides of the Jordan River were — and many still are — Jordanian citizens.
During the summit in Rabat, the Arab League recognized the Palestine Liberation Organization as the “sole and legitimate” representative of the Palestinian people everywhere. For the most part that has been accepted. But Jordan continues to host the single-largest group of Palestinian refugees: 42% of all registered Palestinian refugees live in Jordan and have full Jordanian citizenship.