When proof is made to the judge that a person previously admitted to bail on a criminal charge is about to abscond, and that his bail is insufficient, the judge shall require such person to give better security, or, for default thereof, cause him to be committed; and an order for his arrest may be indorsed on the former commitment, or a bench warrant therefor may be issued, setting forth the cause thereof. The bench warrant shall be issued by the clerk, upon direction of the judge.