Such coordinated or consolidated pretrial proceedings shall be conducted by a judge or judges to whom such actions are assigned by the judicial panel on multidistrict litigation
. For this purpose, upon request of the panel, a circuit judge or a district
judge may be designated and assigned temporarily for service in the transferee district
by the Chief Justice of the United States
or the chief judge of the circuit, as may be required, in accordance with the provisions of chapter 13 of this title. With the consent of the transferee district court,
such actions may be assigned by the panel to a judge or judges of such district.
The judge or judges to whom such actions are assigned, the members of the judicial panel on multidistrict litigation
, and other circuit and district
judges designated when needed by the panel may exercise the powers of a district
judge in any district
for the purpose of conducting pretrial depositions in such coordinated or consolidated pretrial proceedings.