A host country may declare persona non grata status for any member of a diplomatic staff at any time without any explanation.
If not recalled, the receiving state "may refuse to recognize the person concerned as a member of the mission".
Breaches of these articles can lead to a persona non grata declaration being used to punish erring staff.
[1] In non-diplomatic usage, referring to someone as persona non grata is to say that the person is not popular or accepted by others.
[7] In the Philippines, local legislatures of provinces, towns, and cities can declare certain people or groups, including non-diplomats and Filipino citizens, as persona non grata to express a negative sentiment toward the certain person through a non-binding resolution.