In a statement on Monday, he said he had consulted with associates and constituents before making the decision. Nnamani confirmed his relationship with President-elect Bola Tinubu and pledged to continue to support him.
He expressed confidence in Tinubu's ability to promote good governance, human rights, and the rule of law for all Nigerians. Nnamani had previously stated that he would not change his decision to support Tinubu in the 2023 elections, citing the PDP's breach of its constitution by subverting the principle of power rotation.
In the most recent senatorial election, Nnamani lost to Labour Party candidate Kelvin Chukwu, who received 69,136 votes to Nnamani's 48,701 votes.
Nnamani's departure from the PDP is the latest in a series of defections from the party ahead of the 2023 general elections. The PDP, which has been in opposition since 2015, has been plagued by infighting and leadership struggles. Some party members have accused the national leadership of failing to address these issues, leading to a loss of faith in the party.
Nnamani's decision to leave the PDP is particularly significant given his previous position as governor of Enugu state, where the party has enjoyed significant support.