United States Senate Select Committee on Ethics

The U.S. Senate Select Committee on Ethics is a select committee of the United States Senate charged with dealing with matters related to senatorial ethics. It is also commonly referred to as the Senate Ethics Committee. Senate rules require the Ethics Committee to be evenly divided between the Democrats and the Republicans, no matter who controls the Senate, although the chairman always comes from the majority party.

Pursuant to Senate Rule 25, the committee is limited to six members, and is equally divided between Democrats and Republicans. This effectively means that either party can veto any action taken by the committee.

Source

(incomplete list)

...
Wikipedia