Busia Senator on Monday took on judges hearing the Finance Act case telling them that their ruling was against public interest.
Omtatah had sought to have National Assembly Speaker Moses Wetang'ula and his Senate counterpart Amason Kingi cross-examined over their affidavits.
Both Wetang'ula and Kingi have sworn affidavits saying there was a concurrence between the Senate and the National Assembly in passing the Finance Bill, 2023 which has since been signed into law.
But judges David Majanja, Christine Meoli and Lawrence Mugambi declined the request.
"That ruling is not in my favour and you won't be serving justice if we continue like this," Omtatah told the bench.
"Please Mr Omtatah, we have made a ruling," Justice Majanja who is the presiding judge said.
But an angry Omtatah went on.
"The speaker has told lies. Lies which are very fundamental to this hearing. He has even claimed that I got documents unprocedurally yet I am a sitting Senator," Omtatah said.
"It is only fair he comes here to be cross-examined."
He was however shut down by Majanja who insisted the court had made its ruling as regards that application.
The judges are hearing the consolidated petitions challenging the implementation of the Finance Act 2023.
The Law Society of Kenya is challenging the backdating of the housing tax to July 1 saying employees and their employers should not be subjected to double pain because July salaries have already been paid.
LSK president Eric Theuri told the judges that the housing tax has an irreversible effect and workers will have lost in the event the law is found to be unconstitutional.
As such, they are seeking conservatory orders suspending the deduction of housing tax and the backdating of deductions to July 1.
"We are seeking orders that housing tax cannot be implemented for the period there was a conservatory order suspending the implementation of the Finance Act," Theuri said.
The judges have retreated to consider the arguments before returning to issue their ruling.
