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Churchill was involved in negotiations with Sinn Féin leaders and helped draft the Anglo-Irish Treaty. Elsewhere, he was responsible for reducing the cost of occupying the Middle East, and was involved in the installations of Faisal I of Iraq and his brother Abdullah I of Jordan. Churchill travelled to Mandatory Palestine where, as a supporter of Zionism, he refused an Arab Palestinian petition to prohibit Jewish migration to Palestine. He did allow some temporary restrictions following the 1921 Jaffa riots.