Baringo County Assembly has become first devolved unit to reject the Building Bridges Initiative (BBI) Bill.
The ward representatives voted against the Bill after a heated exchange.
Jubilee MCAs and their Kanu counterparts caused commotion in the assembly after failing to find a common ground.
The ruling party lawmakers, who are the majority, opposed the Bill while Kanu were in support of it.
The ward reps exchanged blows before police intervened and lobbed teargas canisters.
They were forced to scamper for safety.
The scuffle came a day after a section of Jubilee Party MCAs from the Rift Valley county leaked a video after a session with JP Secretary-General Raphael Tuju.
Tuju warned the nominated MCAs that they risk losing their seats if they fall to endorse the BBI Bill.
However, one of the ward representatives confronted the SG, demanding to know from him when the party sat and agreed on an official position.
The fearless MCA asked Tuju if Deputy President William Ruto and Jubilee Deputy Secretary-General Caleb Kositany were consulted.