COMMONS Speaker John Bercow could face a probe into bullying claims if MPs back new conduct rules tomorrow.

They will debate changes recommended in a report by ex-judge Dame Laura Cox.

Some MPs are ready to back calls for parliamentary standards commissioner Kathryn Stone to probe complaints dating back over seven years — without the standards committee’s approval.

This could mean an investigation into Mr Bercow if a complaint is made.

A source said: “The Speaker is on his last warning. One false move and we’ll have him.”

Mr Bercow has denied bullying allegations