((a)) In the case of any individual who has been or may be called to testify or provide other information at any proceeding before or ancillary to either House of Congress, or any committee, or any subcommittee of either House, or any joint committee of the two Houses, a United States district court shall issue, in accordance with subsection (b) of this section, upon the request of a duly authorized representative of the House of Congress or the committee concerned, an order requiring such individual to give testimony or provide other information which he refuses to give or provide on the basis of his privilege against self-incrimination, such order to become effective as provided in .

((b)) Before issuing an order under subsection (a) of this section, a United States district court shall find that—

((1)) in the case of a proceeding before or ancillary to either House of Congress, the request for such an order has been approved by an affirmative vote of a majority of the Members present of that House;

((2)) in the case of a proceeding before or ancillary to a committee or a subcommittee of either House of Congress or a joint committee of both Houses, the request for such an order has been approved by an affirmative vote of two-thirds of the members of the full committee; and

((3)) ten days or more prior to the day on which the request for such an order was made, the Attorney General was served with notice of an intention to request the order.

((c)) Upon application of the Attorney General, the United States district court shall defer the issuance of any order under subsection (a) of this section for such period, not longer than twenty days from the date of the request for such order, as the Attorney General may specify.