Mr Olorunrinu lost his re-election bid to APC candidate, Mojisola Alli-Macaulay, in March 9 House of Assembly election with just 278 votes.
He vowed not to challenge the result at the election tribunal.
The lawmaker informed the House of his defection at the plenary through a letter titled: “Letter of Defection from PDP to APC, addressed to the Speaker, Mr Mudashiru Obasa.
The letter was however, read by the Clerk of the Assembly, Azeez Sanni.
The letter read in part: “I have been a young progressive-minded person and I have decided to realign with the APC based on moving trend and party to reckon with taking Lagos State to the next level.
“I will like to appreciate Mr Speaker for his continuous act of service to my constituency. This explains the magnanimity of Mr Speaker.”
Mr Olorunrinu earlier, said in 2015, there were eight PDP members in the House but seven defected adding that, in all sincerity I made bold to say here that, I have never had any regret.
He said he was happy to still find himself in the midst of great administration.
“Sincerely, I said to myself that continuity as a young man in politics is a necessity. I said to myself that I must join the progressives’ party, which is the APC.
“Permit me to say this in this hallowed chamber that the PDP has been discovered by my humble self as a party that is not to be reckoned with, not to be reckon with because it is a party that lacks structure, it is a party that lacks visions for Nigeria of tomorrow.
“That’s the more reason why I said to myself that we must start from here and preach the good news of APC. I want to say a very big thank you to Mr Speaker for accepting me,” Mr Olorunrinu said.
He apologised to the Speaker for his late defection.
According to Mr Olorunrinu, he has spoken with his constituents, stakeholders of different cadres on the decision to join the moving train”.
The Speaker welcomed Mr Olorunrinu to APC and commended him for his decision while other APC lawmakers also received the defector into the party.
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