Inspector General Michael Horowitz said on Wednesday that his office will be investigating previous Foreign Intelligence Surveillance Act warrants after a review of the Trump-Russia probe revealed a report riddled with FISA and FBI procedural errors.
Last week Horowitz slammed the "failures" of federal investigators in the Russia probe, claiming that numerous officials had committed "basic and fundamental errors" while looking into Trump's alleged involvement with Russia during the 2016 election.
The inspector general, concerned that the errors in that report might be indicative of "a wider problem" in the ranks of federal investigators, told lawmakers during a Senate Homeland Security and Governmental Affairs Committee hearing on Wednesday that his investigators will do an audit of past counterintelligence and counterterrorism FISA applications.
Horowitz, emphasizing the relative novelty of his investigation, said nobody has yet undertaken a "deep dive" into FISA before.
