If the receiving state does not approve a diplomat on account of his past activities, he is considered

If a receiving state does not approve a diplomat on account of their past activities, the diplomat is considered a persona non grata. This means that the diplomat is unacceptable to the host government and must leave the country. The term is derived from Latin, meaning "an unwelcome person." This action is a serious form of diplomatic protest and is usually taken when there is a major disagreement between the sending and receiving state. Once a diplomat is declared persona non grata, they lose their diplomatic immunity and may be subject to arrest or expulsion from the country.