2 U.S.C. § 193 : US Code - Section 193: Privilege of witnesses

Search 2 U.S.C. § 193 : US Code - Section 193: Privilege of witnesses

No witness is privileged to refuse to testify to any fact, or to
produce any paper, respecting which he shall be examined by either
House of Congress, or by any joint committee established by a joint
or concurrent resolution of the two Houses of Congress, or by any
committee of either House, upon the ground that his testimony to
such fact or his production of such paper may tend to disgrace him
or otherwise render him infamous.