In 1989, Botha suffered a stroke and was replaced by FW De Klerk, who announced on 2 February 1990 that the ANC, SACP, PAC and other liberation movements were to be unbanned. This was a dramatic step, even for the National Party, but it was the pragmatic and moderate attitude of Mandela and Mbeki that played a crucial role in paving the way forward. Both of them reassured the National Party that the mass Black constituency would accept the idea of negotiations. A new constitutional order was in the offing. As a sign of goodwill, De Klerk set free a few of the ANC's top leadership at the end of 1989, among them Govan Mbeki.