Two senior political sources said Mugabe agreed to resign on Sunday but Zanu-PF did not want him to quit in front of the military, an act that would have made its intervention look like a coup.
Mugabe ploughed on for a few more minutes‚ rounding up by saying: "We must learn to forgive and resolve contradictions‚ real or perceived‚ in a comradely Zimbabwean spirit".
In a televised address, the president defied expectations he would step down, pitching the country into a second week of political crisis.
He stunned Zimbabweans in the rambling address by avoiding any mention of resignation.
Mugabe's wife, Grace (52), who had forced her way into the party as the women's league chairperson in 2014 after expelling several people, was banned from Zanu-PF for life. Officials said the leader, who held power for almost four decades, was expected to resign, but Mugabe never formally stepped down.
First, the Senate and National Assembly must hold a joint sitting, and by simple majority vote decide if the president should be removed.
"We are expecting the motion to be moved tomorrow, the committee to be set up tomorrow, and hopefully by Wednesday - because the charges are so clear - we expect that by Wednesday, we should be able to vote in parliament", Mr Mangawana said.
Zimbabwe's longtime President Robert Mugabe, the world's oldest head of state at 93, is resisting calls to step aside.
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Having been sacked by his party, Mugabe has run out of options but appears to be steadfastly clinging to the very last vestiges of power.
Despite their best efforts to give the dictator a face-saving retirement after 37 years of dictatorial power, Mugabe double-crossed them in yesterday's speech.
Lovemore Madhuku teaches law at the University of Zimbabwe.
Higher education minister Jonathan Moyo, local government minister Saviour Kasukuwere, and finance minister Ignatius Chombo are in military custody since last week when the military army took over government.
This came as legislators have also scaled up preparations for Mugabe's impeachment today.
The takeover was preceded by Mugabe dismissing Vice President Emmerson Mnangagwa. "Mugabe, your rule is over".
He added; "There is no doubt that we meet here today with a heavy heart, we have all worked closely with the outgoing President R.G Mugabe who has given us solid leadership that leaves behind many landmark achievements". "They can submit Mnangagwa as the person they have nominated and say in accordance with the constitution, this is the person we have nominated". It is not a one day or two day process, it can go for months and can also involve the courts if the person you are impeaching wants to take advantage of a number of rights that are in the constitution.
November 16: State-run media publish extraordinary photos of a smiling Mugabe shaking hands with the army commander at the State House amid negotiations on the president's exit as the military tries to avoid accusations of a coup.