The investigation into former CIA chief John Brennan is in turmoil after intelligence head Tulsi Gabbard revoked the security clearances of potential witnesses, four Trump administration officials told Axios.

The witnesses were central to prosecution efforts to prove Brennan skewed a 2017 intelligence assessment to suggest Russian President Vladimir Putin had a “clear preference” for Donald Trump—and that Brennan later lied about it to Congress.

Gabbard, Trump’s Director of National Intelligence, announced on Aug. 19 that she was stripping 37 current and former intelligence officials of clearances, accusing them of “politicizing and manipulating intelligence” and “leaking classified intelligence without authorization.”

The move blindsided the Justice Department, which hadn’t been notif

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