Chargé d'Affaires ad Interim
A chargé d’affaires ad interim (often abbreviated CDA or chargé d’affaires a.i.) is the diplomat who temporarily leads an embassy in the absence of the ambassador. The position is common, often unremarkable, and occasionally the most consequential role in the building.
What It Is
When an ambassador is traveling, recalled for consultations, or when a post is between confirmed ambassadors — a frequent occurrence during political transitions — the senior diplomat remaining at the mission assumes the role of chargé d’affaires ad interim. The ad interim distinguishes this temporary assignment from a chargé d’affaires en titre, who holds the position as a permanent appointment rather than as a stand-in.
The chargé d’affaires carries the full legal authority of the ambassador for all diplomatic purposes during the interim period. They can receive and send official communications, meet with host-country officials, and represent their government’s positions. Under the Vienna Convention, their diplomatic status and protections are fully intact.
During extended periods without a confirmed ambassador — common in the United States, where Senate confirmation delays often leave posts vacant for a year or more — the chargé d’affaires ad interim effectively runs the embassy indefinitely. In practice, this means conducting high-stakes diplomacy, managing crises, and making real-time judgments without the political authority that comes with a Senate-confirmed appointment.
Etymology
The title is entirely French. Chargé means “charged with” or “entrusted with.” Affaires means “affairs” or “business.” Ad interim is Latin for “for the meantime.” The full phrase therefore means “one entrusted with affairs for the meantime.” French and Latin together signal the title’s origin in the era when both languages were standard in European diplomatic practice.
A Concrete Example
When U.S. ambassadors are withdrawn in a diplomatic rupture — as occurred between the United States and Venezuela in 2019 — the embassy may continue operating under a chargé d’affaires ad interim. The chargé manages the remaining consular functions, communicates with the host government on essential matters, and represents U.S. interests without the political standing of a confirmed ambassador. This deliberate downgrading of representation communicates displeasure while maintaining a residual channel.
Common Misconception
The chargé d’affaires ad interim is sometimes confused with a deputy chief of mission (DCM). They are not the same, though they are often the same person. The DCM is a permanent staff position — the second-ranking diplomat in an embassy. The chargé d’affaires a.i. is a temporary function that the DCM assumes when the ambassador is absent. Once the ambassador returns, the DCM reverts to that role. The title is situational, not a rank.