- Moyo said the army acted unconstitutionally when it briefly took power from the government in November.
- Moyo also said that the new government under Mnangagwa was an "illegal regime" that had struggled to assert its legitimacy.
Zimbabwe's former president Robert Mugabe was ousted by a "military coup" that forced his resignation, former cabinet minister Jonathan Moyo said in an interview with the BBC broadcast on Thursday.
Moyo, a former higher education minister under the last president and an ardent Mugabe loyalist, said Zimbabwe's new President Emmerson Mnangagwa stole power and was leading an "illegal regime".
"Mnangagwa and (Vice President Constantino) Chiwenga, they know only too well that they have come into power via the bullet and not the ballot," Moyo, who is in self-imposed exile, told the BBC's Hard Talk programme.
It was unclear where he gave the interview.
"We have a... constitution that the people of Zimbabwe made for themselves and it has been broken and it has been broken via a coup," he said.
"The constitution of the country has been subverted and there has to be a return to constitutionalism."
Moyo said the army acted unconstitutionally when it briefly took power from the government in November.