Inspector general
Definition
An inspector general (IG) leads an independent oversight office inside a federal agency, tasked with auditing and investigating fraud, waste, abuse, and mismanagement within that agency. IGs are meant to operate independently of the officials whose work they review.
Why it matters
IGs are one of the few checks that operate from inside the executive branch itself, making their independence, especially protection from at-will removal, central to whether they can actually investigate politically sensitive matters. Because the president can still remove an IG, subject only to a 30-day notice requirement to Congress, mass removals can gut oversight capacity across the government almost overnight.
Seen in the wild
On January 24, 2025, President Trump fired at least 17 inspectors general in a single night without the 30-day advance notice to Congress required by statute. A federal judge ruled the firings unlawful on September 24, 2025, but declined to reinstate the IGs, leaving the practical effect largely unchanged.1