Machakos MCAs have ousted Deputy Governor Francis Maliti from the CEC Finance docket.
The county legislatures on Wednesday impeached Maliti on grounds of incompetence and gross violation of the Constitution.
Thirty-three MCAs out of 59 voted in favor of the motion sponsored by Matungulu East MCA Cosmas Masesi.
Masesi was seconded by his Kangundo Central counterpart Moses Mitaa.
The session was boycotted by 26 MCAs allied to Governor Alfred Mutua's Maendeleo Chap Chap party and his administration.
Speaker Florence Mwangangi directed that a five-member committee be instituted to investigate the claims on the deputy governor.
Machakos has always been rated as the best in terms of development compared to the other 46 counties.
The MCAs also claim that Mutua appointed Maliti for the Finance docket without following the right procedure as stipulated in the Constitution.
However, as the MCAs deliberated on the motion, 25 MCAs led by Kangundo West MCA Titus Kaloki convened a press conference away from the assembly's premises where they termed the impeachment process as an illegality and total wastage of time.
"We have decided that we will not be party to that business going on in the assembly of selfish blackmail against the deputy governor. The public should know that the debate in the assembly is about a group of MCAs who want money for personal allowances and trips but have refused to pass the County Integrated Development Plan (CIDP) and development budget for the benefit of wananchi," Kaloki said.