Describing Monday's planned meeting as a "watershed," Chamisa said his party wanted the protracted talks to end.
Mugabe told the state media that Monday's meeting would be the final one, and that he would form a government without the opposition if no agreement was reached.
Chamisa responded by saying: "Mugabe is a failure and cannot dictate pace. If they choose to terminate the talks by their arrogance, let it be, we will not give Mugabe latitude to be funny.
"We are the winners and therefore we should be indicating which issues to deliberate on. So we will not give Mister Mugabe latitude to be funny because there is no time for that, people are suffering."
Zimbabwe: Tsvangirai committed to power deal
Zimbabwe: Rights activist is 'threat to society'
The agreement, under which Mugabe would remain as Zimbabwe's president and Tsvangirai would become prime minister, follows last June's hotly disputed presidential runoff, which was marred by more than 200 deaths, mainly among opposition supporters. Tsvangirai had won the first round in March, but failed to reached the threshold required.
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