Mugabe, 93, was forced to resign under military pressure and the threat of impeachment.
Calling the takeover "unconstitutional", Moyo went ahead to describe the manner in which he fled the country, which accorded to him was because of a "death warrant" issued by the military. "There is no evidence", Jonathan Moyo told Reuters by phone from an undisclosed location, in one of the first detailed accounts from a Mugabe supporter since the coup.
"You have to be applying a Banana Republic model to say he resigned", he charged.
A section of the liberation movement aligned with Mnangagwa while another sided with Mugabe's controversial wife, Grace, who until the intervention of the military looked set to succeed her husband.
He continued saying, "if you don't intervene when there has been such an outrageous, brazen attack on a constitutional order, you are simply opening the floodgates to conflict", he said.
"If they don't act, just as the sun will rise tomorrow, Zimbabwe will be another Somalia".
The Kenyan government recently denied offering asylum to Moyo, who is wanted in Zimbabwe on allegations of corruption - in particular, the embezzling of funds meant for tertiary institutions.
"So really this is a bitter, bitter defeated politician", Charamba said.
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It was his first appearance in the media since he fled the country mid November past year.
Moyo said he narrowly escaped with his life.
"They still have aspirations to harm me".
Responding to Moyo's remarks on a local radio station, Presidential spokesperson George Charamba said: "Moyo should come to Zimbabwe and clear his name in the courts of law and not on BBC HardTalk".
The initiative is meant to legitimize the ongoing political transition in Zimbabawe following the resignation of long-serving former president Robert Mugabe in November, 2017, at the insistence of the ruling Zanu PF party and the subsequent swearing in of Mnagagwa on Nov 24 as interim president.
"I will never, ever accept the proposition that those who use violence have outsmarted me", he said.
"At about 2.30am, about 15 to 26 members of the military special forces stormed my house, with the intent to kill me".