Mr Mugabe, born 21 February 1924, was a communist and nationalist revolutionary.
According to Reuters, the plot hoped to install an interim unity government backed by the blessing of the international community to allow for Zimbabwe to usher in a "new era".
In the draft impeachment motion, ZANU-PF - which expelled Mugabe from the party on Sunday - accused him of being a "source of instability", flouting the rule of law and presiding over an "unprecedented economic tailspin" in the last 15 years.
The 93-year-old Mugabe had ruled Zimbabwe since the country won independence from Britain in 1980.
Mugabe abolished the Office of Prime Minister to appoint himself President of Zimbabwe in 1987.
The U.S. State Department echoed the sentiment.
"The only way forward for Zimbabwe is for fresh elections to be held immediately". His party had seconded the impeachment motion. Its primary aim was to stabilize its economy.
Zanu PF seeks the co-operation of the main opposition MDC-T to pass the necessary votes to impeach Mugabe.
In 1992, Mugabe's wife Sally died. "Everyone was engulfed with excitement and they are looking for a better future, a brighter future with work".
"Let's concentrate on the potential, the hope for Zimbabwe, an incredible country".
Before the resignation, crowds rallied outside the parliament building, dancing and singing.
Robert Mugabe resigned as Zimbabwe's president on Tuesday a week after the army and his former political allies moved against him, ending four decades of rule by a man who turned from independence hero to archetypal African strongman. Indeed, one of the themes of the demonstrations over the weekend was for South Africa to keep out.
The massive anti-Mugabe protests that took place over the weekend were a clear rejection of that legacy.
He said Mugabe and his family were "safe and sound, and their security is guaranteed".
Now Boris Johnson has vowed to aid the former British colony if Zimbabwe's new leader Emmerson Mnangagwa reaches out to the UK.
Grace Mugabe has not been seen since the military stepped in. That night, the president made a nationally televised address in which he was expected to resign.
China will not interfere and is happy to let Zimbabwe's people make their own choices, said Shen Xiaolei, an Africa expert at the Chinese Academy of Social Sciences government think-tank.
The cable, dated Oct 23 and written by someone within the Central Intelligence Organisation (CIO) to an unknown recipient, also says Mugabe spoke to South African President Jacob Zuma about his rivalry with Emmerson Mnangagwa, the vice president whose sacking by Mugabe prompted the army action.
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