The Justice Department made the surprising concession in response to an inspector general's (IG) report that found "significant" errors and omissions in four applications submitted to the Foreign Intelligence Surveillance Court (FISC) to surveil Page.

While the IG report was highly critical of the FBI and Justice Department, it did not weigh in on the validity of the four surveillance applications, which were granted under the Foreign Intelligence Surveillance Act (FISA). (RELATED: FISA Judge Blasts FBI For Submitting False Information About Carter Page)

But Boasberg, who presides over the FISC, said in an order on Jan. 7 that the Justice Department concluded that the second and third renewals of the Page surveillance warrants "were not valid."