Plenary at the House of Representatives turned rowdy on Wednesday as the Speaker, Femi Gbajabiamilia, said he received a letter from opposition members, which he was about to read to the lawmakers.
A member of the Peoples Democratic Party, Mr Kingsley Chinda, however, raised a point of order but the Speaker ruled him out of order.
The sergeants-at-arms moved to protect the mace while Gbajabiamila, in the heat of the controversy, adjourned the plenary.
Factions of the PDP caucus in the House have presented parallel principal officers.
A faction claims that the letter Gbajabiamila was about to read did not come from the PDP.
The Speaker was guarded out of the chamber amid cheers and jeers.