CRS report via FAS – The Vacancies Act: A Legal Overview, October 30, 2017.

“This report first describes how the Vacancies Act operates and outlines its scope, identifying when the Vacancies Act applies to a given office, how it is enforced, and which offices are exempt from its provisions. The report then explains who may serve as an acting officer and for how long, focusing on the limitations the Vacancies Act places on acting service. Finally, the report turns to issues of particular relevance to Congress, primarily highlighting the Vacancies Act’s enforcement mechanisms.”