Charles Cooper, the well-known Republican lawyer, wasn't simply in attendance at U.S. Attorney General Jeff Sessions' congressional hearing one week ago to support his friend. Cooper is Sessions' personal lawyer, he confirmed in an email Tuesday.

Cooper didn't provide additional details on the nature of the representation—including whether it extends to the criminal inquiry into Trump campaign affiliates' involvement with Russia.

Peter Carr, a spokesperson for the Justice Department's investigation, declined to comment because the probe is ongoing. Spokespeople for Sessions didn't immediately respond to requests Tuesday.