Legislators Charles Njagua and Babu Owino fought at Parliament's media centre on Tuesday, forcing sergeants at arms
It is not clear why the Starehe and Embakasi East MPs resorted to blows but journalists at the centre said Njagua followed Babu after he walked in.
They said he had been chatting with them when his counterpart grabbed him from the back and started pulling him while yelling.
It was then that a confrontation ensued.
Njagua is popularly known as musician Jaguar while Babu is former UoN student union leader.
"We heard Jaguar shouting 'you cannot do that to the President. He is not a caretaker President'," one of the journalists said.
The two newly elected MPs are being held in the chambers.
The Embakasi East MP angered Kenyans after apparently referring to President Uhuru Kenyatta as mtoto wa mbwa.
He was charged with subversion, insulting Uhuru and incitement to violence.
He spent two nights in police cells and was eventually released on Sh200,000 cash bail.