Here's what I think his response should be:
"Senator, the documents to which you refer were made available to the Library of Congress some months ago. Your request should have been made to that organization, rather than to me. You had four months to prepare for this hearing, and if you failed to do so, that does not obligate this committee to provide you with additional time to accomplish what should have been done during the preparation period."
That's good, fax it to Specters office.
That would be darn near perfect.