I may have misspoken. What I wanted to say is that there's already a definition. Part of that definition is in the Lobbying Act. In fact, it mentions subsection 128(1) of the Public Service Employment Act.
Remove that section and determine who is a public office holder in a minister's office, for example.
There's also a regulation. If you look at the lobbyists registration regulations, you will see that there is a long list of people who can be designated as public office holders. That list could be added to the Lobbyists Act.