Why did the clerics in Iran allow Muhammad Khatami to run for president?

DescriptionPlease read Cleveland’s “A History of the Middle East”, chapter 24 and answer one or more of the following questions. Please make as simple as possible.
Why did the clerics in Iran allow Muhammad Khatami to run for president?
According to Cleveland, what accounts for the growth of Islamic movements in Egypt under Mubarak?
How did Mubarak respond to Islamic movements?