Basically, Heikal was one of the most important Arab voices of the 1950s and 1960s (close ally of Nasser) and still has a huge following throughout the region. As a sign of his popularity, he has how own_show on Al-Jazeera which consists of nothing but him giving lectures on Arab history (usually that he was involved in). Due to his position of influence during this period, Heikal obtained a tremendous amount of primary source documents related to Egyptian foreign policy and there are usually the subject of his show. For example, he will pull out a letter that Eisenhower sent to Nasser (which Heikal stores in his house) and then talk about it for an hour.
Some people in Egypt, however, wonder whether Heikal has the right to do this. For one, there’s the question of whether a private citizen should be permitted to own so many primary source documents or whether they are the rightful property of the state. Secondly, there’s a question of whether Heikal has the right to talk about what might be classified information on the air. According to this article, an NDP person is calling for an investigation into both of these questions. Heikal does not talk about current Egyptian politics on the air nor is he especially critical of the Government, so I don’t think its a question of domestic politics.