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The elections will be a major test for Mnangagwa who succeeded veteran former president Robert Mugabe in November.
Mugabe, who was ousted from office in November after a brief military takeover, has not commented on whether he will appear before the committee.
A Zimbabwean parliamentary committee is summoning former leader Robert Mugabe to explain past comments on alleged diamond looting.
Zimbabwe on Wednesday marked its first independence day without Robert Mugabe in power, with new leader Emmerson Mnangagwa vowing to hold "credible" elections.
It was unclear whether Mugabe, 94, who has not been seen in public since his ousting, could be forced to face a grilling from lawmakers.
Grace Mugabe had been tipped as a candidate to succeed her husband, 94, who ruled Zimbabwe since independence from British colonial rule in 1980.
Mugabe said his regional neighbours betrayed him "in a sense", in an interview with the privately-owned Zimbabwe Independent newspaper and other regional and international media.
Mnangagwa added in a short statement that he 'noted recent remarks made to the media' by Mugabe who spoke to foreign journalists at a location in Harare.
Mugabe, 94, spoke slowly but clearly to South Africa's SABC broadcaster from an office in Harare, dressed in a grey suit, sitting in front of a portrait of himself and his wife Grace.
Former Zimbabwean president Robert Mugabe described his departure from office in November as a "coup d'etat" that "we must undo" in his first TV interview since then, aired on Thursday.
A copy of the 226-page doctoral thesis, titled "The Changing Social Structure and Functions of the Family" was only published last month following public calls for Grace to be stripped of her PhD.
The former union chief had appointed Nelson Chamisa, 40, as acting president "until the president’s return.”
Mnangagwa, who took office in November after a shock military takeover led to Mugabe's ousting, promised to hold a fair vote.
Bennett until the end remained a vocal critic of Mugabe, who had led Zimbabwe since its independence in 1980 and oversaw a country whose glow of optimism faded under allegations of mismanagement.
Emmerson Mnangagwa has adopted a more diplomatic tone since taking over as leader in November, after the ousting of the authoritarian Robert Mugabe, his former boss.