"CIA contractor-turned whistleblower Dennis Montgomery asserts that “THE HAMMER,” a super surveillance system he designed and built as a foreign surveillance tool to spy on terrorists and other foreign adversaries, was commandeered by John Brennan and James Clapper to unlawfully wiretap Michael Flynn and Donald Trump.
Brennan and Clapper also used “THE HAMMER” to unlawfully spy on Supreme Court justices, FISA court judges, other government officials, Montgomery contends."
The WSJ has a paywall, but you can read the story here:
https://theamericanreport.org/2019/10/08/secret-fisa-court-finding-concludes-fbi-used-secret-foreign-surveillance-tool-to-spy-on-americans-wall-street-journal-reports/