THIS is the shocking moment a wild brawl erupts in the Mexican Senate between two senior politicians.

A photographer was brutally shoved to the ground as tensions boiled over following a heated debate over US involvement in Mexico 's ongoing standoff with deadly cartels.

Shocking footage captured the punching match between PRI leader Senator Alejandro Moreno and Senate President Gerardo Fernández Noroña of the ruling Morena party.

An irate Moreno can be seen storming the lectern at the end of the session as he demanded a chance to speak on the drug gang debate.

Lawmakers were in the middle of singing the national anthem to close the day out when Moreno demanded the floor.

He grabbed hold of Noroña's arm and repeatedly said: "I'm asking you to let me speak."

The senate president pul

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