Except he backs down, Kalu might trigger what played out during the formation of the 8th Senate in 2015 to repeat itself.
Mr Kalu said the party either hand him the position or have him vie for Senate President.
The PDP lawmakers were reacting to the endorsement of Senator Ahmed Lawan by the APC wherein the ruling party picked him as its preferred candidate for the exalted office.
The YPP is the political party on which Mr Ubah ran for the senatorial race and was elected.
The bill passed its second reading on Tuesday.
The Senate Leader, Ahmed Lawan, commended the federal government for its effort on the bill.
The declaration of governor Okorocha was said to have been made under duress.