Chairman of the Political Bureau of Hamas Movement Khalid Mishaal, arrived here today leading a political delegation. During this visit, Mishaal is scheduled to meet Iran's Supreme Guide Ali Khamenei and Iranian President Mahmoud Ahmadinejad. Hamas Bureau in Tehran said that Mishaal is scheduled to discuss with the Iranian officials the details of Makkah agreement as well as the latest developments in Palestine, notably the formation of a national unity government.