Kimilili Member of Parliament Dismus Barasa has faulted the National Assembly over its latest move.
The house on Thursday acquitted Treasury Cabinet Secretary Henry Rotich and his former Trade and Industrialization counterpart Aden Mohammed of blame regarding the contraband sugar saga.
Addressing Radio Citizen reporters at Parliament buildings on Friday, the Jubilee lawmaker hit out at majority leader Aden Duale for leading the house towards the decision.
He raised suspicion over the Garissa lawmaker's conduct, calling for investigation against him on allegations that he might be in the list of the scandal's beneficiaries.
"I do not approve of their conduct under the leadership of the majority leader," he said.
The decision was made in opposition to Homabay Women representative Gladys Wanga's push to have the two cabinet ministers investigated over the poisonous sugar issue.
Barasa further fired at the majority parliamentarians who backed the acquittal of the duo, terming than as insincere in their role as representatives of Kenyans.
Minority leader John Mbadi argued that the blame should instead fall at the doorstep of the Kenya Bureau of Standards (KEBS) for failing to check the product after importation.