Cole told Issa the department has handed over 7, 600 pages of material related to the botched probe, and Holder has testified about the issue seven times.
Academics are increasingly using new technologies at their disposal to search for innovative ways of investigating historical material to enable us to probe new questions and find alternative patterns of investigation.
Lawyers representing Clemens in the civil case had sought to withhold more than 1, 600 pages of documents from the government's criminal probe on the basis that they were grand jury material.
Supporters of the IRA's political arm, Sinn Fein, and Irish-American activists who have long backed the IRA's cause contend the demand for the material is more a politically motivated witch hunt against Mr. Adams than a serious criminal probe.