The PF has endorsed the decision by its losing parliamentary candidates to petition the election victory of some MMD MPs appointed to ministerial positions by President Sata.
Party Secretary General, Wynter Kabimba says the party will back the petitions regardless of the MMD MPs relations with the government.
Mr. Kabimba says the party will not stop members who have petitioned presidential appointees as it is within their rights to do so.
He says Zambians are looking for an environment that will ensure free and fair elections.
Meanwhile, UPND has withdrawal from the february, 16th, 2012 Msanzala by-election in Eastern Province amid fears of vote splitting among opposition parties.
UPND, which is largely dominant in Southern Zambia claims that it is currently pre-occupied by legal battles in the courts of law, as a result of what it terms PF engineered election petitions.
Party Deputy Spokesperson, Cornelius Mweetwa says the decision to withdraw from the race is further meant to consolidate the numbers of the opposition in Parliament to ensure effective checks and balances.
The Msanzala by-election follows the resignation of Independent Parliamentarian: Colonel Joseph Lungu and his subsequent defection to the ruling PF.
Mr. Mweetwa also criticized Colonel Lungu for facilitating a useless by election at the expense of the electorate.
Colonel Lungu is also reported to have applied to re-contest the seat on the PF ticket.