The court challenge automatically cancels Mnangagwa's inaugartaion which had been scheduled to go ahead on Sunday the 12th of August. The Constitutional Court must rule within 14 days and Mnangagwa's inauguration would have to wait for the outcome of Chamisa's challenge.
The MDC alliance filed their paperwork with Zimbabwe's Constitutional Court on Friday, alleging the result of the July 30 vote had been rigged in favour of incumbent Mnangagwa, the leader of the ruling ZANU-PF party.
"The United States government is gravely concerned by credible reports of numerous detentions, beatings, and other abuses of Zimbabweans over the past week, particularly targeting opposition activists", State Department spokesperson Heather Nauert said.
In the announced results President Mnangagwa garnered 50,8 percent against Mr Chamisa's 44, 3 percent to secure victory in the presidential poll.
With the Movement for Democratic Change (MDC) Alliance filing its court case right on deadline, the future for Zimbabwe still looks far from certain. "But if they want to meet us in court we have sufficient legal minds to meet them squarely in court", ZANU-PF legal secretary Paul Mangwana said.
"We are seeking a declaration to the effect that the presidential election was not properly conducted".
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"We have managed to place before the court unpopulated signed V11 forms and V11 forms that shows an attempt to erase the figures that had been entered", he said.
Mr Biti is the first senior opposition politician to be detained since Mr Mnangagwa took over from Mr Mugabe.
Diplomats and election observers were present at the hearing in Harare after Biti fled to Zambia but was handed back to Zimbabwean police despite claiming asylum.
Tendai Biti was released earlier today following my intervention.
The bloc says a core team will remain in the country to monitor the situation in the wake of last week's disputed presidential election.