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ABUJA (Reuters) - Former Nigerian governors, senators and ministers urged parliament on Wednesday to change the constitution to prevent a repetition of the political uncertainty plaguing Africa's most populous country.

President Umaru Yar'Adua has faced growing pressure to transfer power formally to his deputy since leaving Nigeria nearly two months ago for medical treatment in Saudi Arabia.

Analysts say Yar'Adua's tight grip on power has slowed government business, threatens a fragile peace in the oil-rich Niger Delta and raises concern about the legality of decisions made in his absence.

More than 40 former leading politicians, many of whom are members of the president's ruling People's Democratic Party, said parliament must step in to defuse tension caused by his absence.

"The situation before us today is that President Umaru Yar'Adua has been out of the country for over 50 days on grounds of ill health," said the petition from "Concerned Nigerians".

"May we assure you that if we thought that a concrete solution could be found in protests, we would have joined those who protested," it said, referring to last week's rally in Abuja.

MORE FLEXIBILITY

The group, which included former Senate President Anyim Pius Anyim and the chairman of Nigeria's energy firm Oando, Mohammed Magoro, urged parliament to amend the constitution to allow for more flexibility in the handover of presidential power.