The PDP and other political parties said they want to end President Buhari's reign of civilian dictatorship.
Present at the meeting on Thursday, February 9, 2017, were the Peoples Redemption Party (PRP), Social Democratic Party (SDP), Alliance for Democracy (AD), and Accord Party (AP).
The political parties formed a group called United Forum of Democrats.
The forum disclosed that it was yielding to the desire of Nigerians to save the country.
A communique issued at the end of the meeting reads:
"We will stand united and steadfastly work together in the interest of the vast majority of our people who are now suffering and traumatised by the visionless and dictatorial antics of the government of the day.
"We promised to constitute ourselves into an effective, responsible and fearless watchdog and by mutual agreement broaden the base of the opposition so as to constitute an alternative reliable political option for our people and will, therefore, ensure that henceforth, the electoral and security umpires act strictly within the dictates and ethics of their profession.
"Two years into the current administration, all that so-called promise of change was indeed not for positive change but rather a pipe dream that unleashed a series of retrogressive actions that has put our country permanently on the reverse gear.
"As a positive reaction to the above-listed failures of the present regime, and to give hope to all our people , this forum shall work out in detail, in a joint memoranda, a list of basic fundamental requirements necessary for a descent and healthy society that our people eminently deserve and we will jointly endorse those requirements and commit to working assiduously to achieving them in the shortest possible time .
“We, the United Forum of Democrats, uphold the recommendations of the 2014 National Conference and are resolved to work earnestly for its full implementation.
“That we shall work together henceforth in all upcoming elections as we approach 2019 to ensure we enthrone genuine democracy, good governance, respect for the rule of law and put an end to the reign of civilian dictatorship.
“That we are committed going forward to work for the establishment at the centre and in as many states as possible people- oriented participatory governments that will entrench the values, ideals and cherished principles of the United Forum of Democrats."
Meanwhile, APC women say they will hold a national prayer summit for quick recovery of the President Muhammadu Buhari.