H. of C., Jan. 22, 1744-5. But when the peers are sitting as a court of criminal judicature, they may order attendance, unless where it be a case of impeachment by the Commons. There it is to be a request. In several instances House committees, after their invitations to Senators to appear and testify had been disregarded, have issued subpoenas. 10 Grey, 61.
Counsel appear before committees in election cases, however.