The Peoples Democratic Party (PDP) has expelled an Ogun State senator, Buruji Kashamu, from the party.
Three other members of the PDP in Ogun State were also expelled on Monday.
The National Publicity Secretary of the PDP, Kola Ologbondiyan, announced the expulsion at the end of an emergency National Executive Committee meeting of the party in Abuja.
Senator Kashamu, a supporter of erstwhile national chairman of the PDP, Ali Sheriff, was expelled alongside Bayo Dayo, Segun Sarki and Sanimu Sodipo; all from Ogun State.
Mr Dayo was a factional chairman of the PDP in Ogun. He headed the faction of the party loyal to Mr Kashamu.
Mr Kashamu is wanted in the U.S. for drug-related offences. He has repeatedly claimed he is innocent and has resisted moves to extradite him.
In May, the appeal court ruled against Kashamu signifying a possibility he could be arrested, before extradition commences.