Persona Non Grata

Persona non grata (Latin for 'unwelcome person') is the international-law status a host state uses to declare that it will no longer accept a particular foreign diplomat. Based on Article 9 of the 1961 Vienna Convention on Diplomatic Relations, the declaration requires no justification. The sending state must then recall the person, and if it fails to do so, the host state may simply stop recognizing their diplomatic status.