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Nunes criminal referrals are related to open DOJ investigations.
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Leaks
While the Department of Justice does not discuss ongoing investigations or confirm specific matters, it is important for the American people—and for those who might be thinking about leaking sensitive or classified information—to know that criminals who would illegally use their access to our most sensitive information to endanger our national security are, in fact, being investigated and prosecuted. Since January, the Department has more than tripled the number of active leak investigations compared to the number pending at the end of the last Administration. And we have already charged four people with unlawfully disclosing classified material or with concealing contacts with foreign intelligence officers.
https://www.justice.gov/opa/pr/attorney-general-jeff-sessions-delivers-remarks-briefing-leaks-classified-materials
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FISA
Justice Department Inspector General Michael Horowitz confirmed Thursday his office is still investigating possible abuse of the Foreign Intelligence Surveillance Act by the DOJ and FBI in their investigation into President Trump and associates of his 2016 campaign.
https://www.washingtonexaminer.com/news/doj-inspector-general-confirms-year-long-investigation-into-fisa-abuse-is-still-active