Mr Lawan stated this on Friday while addressing Women Parliamentarians, led by Joy Emordi, a former federal lawmaker.
The former governor also said his stay at the red chamber was that of sadness and happiness.
Efforts to achieve the January to December budget implementation was also not possible due to late presentation by President Muhammadu Buhari who only presented the budget early once since his administration came in.
This was the outcome of the meeting between President Muhammadu Buhari and lawmakers-elect of the green chamber when the former hosted them to a dinner Tuesday evening.
He succeeded Walter Onnoghen, ousted for allegedly failing to declare some assets traced to him.
Mr Kalu in a statement said his decision to step down is in the interest of the ruling party and the country at large.
Mr Oshiomhole, a former governor of Edo State, in April, said his party will not cede any position to members of the opposition particularly those from the Peoples Democratic Party (PDP).
The report said the role played by the former Lagos State governor is aimed at positioning him for the presidential contest in 2023.
This was made known on Tuesday by the Chairman, Senate ad hoc committee on Media and Public Affairs, Senator Adedayo Adeyeye while addressing journalist after plenary.
A photograph showing the senator-elect with a certificate has been trending online yesterday but the former governor has described it as fake.