"The civilian (representative) oversight into the compartmented intelligence falls to a very select group known as the Intelligence Gang of Eight.
Four Democrats and Four Republicans (four minority party and four majority party political leaders) for a total of eight. Four from the House and Four from the Senate. –Understand the Gang of Eight Here– The Gang-of-Eight can, if they choose, interact with the intelligence product with the same level of security clearance as the compartment being reviewed.
Only these eight members can interact with the intelligence product in this way. This ensures their ability to conduct oversight.
It is critical to understand the difference between the House Intelligence Committee, the Senate Intelligence Committee and the Gang of Eight. Only two members from the House Intelligence Committee (chair and minority), and two members of the Senate Intelligence Committee (chair and vice-chair) are participants. The other four are Speaker of the House, minority leader of House, Leader of Senate and Minority leader of Senate. The latter four are not part of any other intel committee."
https://theconservativetreehouse.com/2018/01/05/operation-condor-how-nsa-director-mike-rogers-saved-the-u-s-from-a-massive-constitutional-crisis/