How is "binding and loosing" extrapolated to all clergy?

> **Matthew 16:19** > And I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven. I recently read an article in which the Roman Catholic author states, > In the Catholic Church’s understanding, the office of “binding and loosing” which was given to Peter was also assigned to the whole college of apostles who in turn commission their assistants in ministry to do likewise. If it is understood that Jesus was talking to Peter, by what rationale or authority can this "office" be passed on from him to others?