His resignation letter was sent to PDP’s leadership on Wednesday, amid speculations he will return to the Labour Party (LP).
“I hereby with utmost humility inform you of my decision to resign my membership of the PDP with effect from today, June 13, 2018, for some well-thought-out personal reasons.
“It was an honour working with the many prominent Nigerians with whom I shared the PDP platform for the entire period I was in there as a member.
“Accept please the assurance of my very high regards,” the letter read in part.
Mimiko joined PDP in 2014 and later became the chairman of the PDP Governors’ Forum.