Members of Zimbabwe's ruling Zanu-PF party are preparing to meet to discuss the possible impeachment of President Robert Mugabe. <br/><br/>A deadline set by the party for Mr Mugabe to resign ended this morning. <br/><br/>The embattled leader surprised Zimbabweans by saying nothing about quitting in a TV speech late yesterday.<br/>Zanu-PF says, it backs impeachment and proceedings could begin as soon as when parliament meets today. <br/><br/>Mr Mugabe's grip on power has weakened considerably since the country's army intervened on Wednesday in a row over who should succeed him. <br/><br/>The crisis began two weeks ago when the 93-year-old leader sacked his deputy Emmerson Mnangagwa, angering army commanders. <br/><br/>The army saw it as an attempt to position his wife Grace as next President. Zimbabwe has since then seen huge street rallies demanding his immediate resignation.