Son of founder president Abeid Karume, he said the idea of union had been fomented much earlier than 1964 and before the independence of Tanganyika and the Isles Revolution, intoning that the union was not a mushroom sprouting due to heavy monsoon rains but has its origins and traditions.
Katika kikao cha pamoja cha NEC ya TANU cha Bara na NEC ya ASP cha Zanzibar, kilichofanyika Dar es Salaam, Septemba 5, 1975, Mwalimu Nyerere alipendekeza vyama hivyo viungane ili kuimarisha zaidi Muungano. Jumbe alikubali kimsingi wazo hilo, lakini akataka ASP kipewe muda kufikiria zaidi.