The People's Democratic Party (PDP) said it would cooperate with the in-coming All Progressives Congress (APC) government for improved development of the country.
The party’s National Publicity Secretary Olisa Metuh disclosed this at a news conference on Tuesday in Abuja.
He said that PDP would be an opposition that would offer alternative programmes and ideas to the new government and would not be involved in abuses.
"We promise that in the course of this, we will work with the President-elect, General Muhammadu Buhari, to move the country forward as a nation.
"We will cooperate with him in terms of promoting the values of our country and progress all indices for national growth and foster national unity and the development of the country and its democracy.
"We will not engage in any activity that will destabilise the nation or the polity or distract the President-elect from offering Nigerians good leadership," Metuh assured.
He said that the party was adopting the position because the interest of Nigeria was more important than that of a political party or any individual.
The PDP spokesman, however, said that being in opposition was not being out of power, adding that the party would return to power in 2019.
He stressed that while in the opposition, PDP would conduct its affairs with all decency, maturity, civility and the forthrightness it could muster.
He said that the PDP would be the ideal opposition it had always wanted the APC to be, stressing that with cooperation, the two parties would salvage the country`s democracy.
He stated that the legacy of the PDP in its 16 years in government was the sustenance of democracy, which, he said the party would do everything to sustain.
According to Metuh, in spite of some irregularities in the March 28 Presidential and National Assembly elections, the PDP will do everything to ensure that the President-elect succeeds in office.
This, he explained, was because of the party’s belief in the sustenance of the country's democracy.
He, however, hinted that the party would not condone any form of intimidation of its key officials and appointees by the APC or any plan to destabilise it.
He disclosed that the party was in the process of rebuilding its fold "on justice, fairness and equity to enable it return to government".
On the impeachment notice served on Governor Ayodele Fayose of Ekiti state, Metuh said that though the PDP was worried by the development, it would not interfere in the matter.
"We will not interfere with the duties of the legislature under the Constitution, but we believe that our governor will respond accordingly once the legislators follow due process," he said.