Question: Mansur al-Atrash, was a Syrian politician and journalist, during the period of the United Arab Republic (1958–61), Atrash became a strong supporter of Egyptian president and which pan-Arab leader, who was the second President of Egypt, serving from 1956 until his death?
Sentence (from "Mansur al-Atrash"): During the period of the United Arab Republic (1958–61), Atrash became a strong supporter of Egyptian president and pan-Arab leader Gamal Abdel Nasser.
Relevant evidence: Yes