I am reliably told that Mugabe reminded Tsvangirai that according to the Constitution of Zimbabwe, he, as Head of State, had sole authority when it comes to international agreements.
Effectively, Mugabe was telling Tsvangirai to mind his own business and leave the matter of the membership of Zimbabwe in the Commonwealth to the Head of State. The dictator vowed that Zimbabwe will not return to the Commonwealth as long as he is still leading the country.
Tsvangirai had brought up the subject in the context of "reintegrating" Zimbabwe into the international community, pointing out that there would be material advantages to Zimbabwe being a member of the Commonwealth.
This raises the question of just what sort of "policy formulation authority" the Prime Minister has. Suggesting re-engaging the Commonwealth is certainly a policy initiative. But the President clearly thinks this is one of many areas where the Prime Minister’s mandate does not apply.
Mugabe apparently believes that going back to ask to be part of this group is tantamount to being colonised again. He especially objects to what he calls the "dictatorship of Britain" in the grouping of former colonies. www.denfordmagora.blogspot.com