More leaders allied to the opposition have come out to support the heating referendum push.
Alego Usonga parliamentarian Samuel Atandi has also rooted for the proposed changes.
Speaking on Citizen TV's Daybreak Show Friday morning, the lawmaker seconded the proposal to expand the executive.
He termed it one of the only few ways to eradicate the exclusion feeling among some sections of Kenya which feel left out due to the absence is their leaders at the top.
Atandi is also of the opinion that the nation should shift from its current presidential system where all the power revolves around the President.
"I want to see an expanded Executive, where Kenyans are represented on the table. One of the things we must achieve is to devolve the presidency," said Atandi.
He also hit out at forces opposed to the changes, saying that the reforms are inevitable and the only thing they can do is propose what they want or do not want to be changed.
"The question on whether we will have a referendum is closed. It is going to be there. Let us now look at the issues we are going to push," added the parliamentarian.
The changes enjoy the support of President Uhuru Kenyatta, opposition leader Raila Odinga and other opposition figures.
However, they are being opposed by Deputy President William Ruto who only wants the re-introduction of the opposition leadership slot.