Since this is constitutional it does not impinge on the powers of Congress. Congress, however, must observe its own rules in the power of inquiry in aid of legislation while the rights of the witnesses should be respected.  -   Ismael Khan     Quotes
Since this is constitutional it does not impinge on the powers of Congress. Congress, however, must observe its own rules in the power of inquiry in aid of legislation while the rights of the witnesses should be respected. Ismael Khan
 Congress