Lawyers representing John O. Brennan, the former C.I.A. director, are preparing to argue against potential charges. They aim to use a defense based on claims of vindictive prosecution if charges are filed.
Since late last year, Justice Department officials and certain media outlets have openly discussed investigations targeting Brennan. These investigations are notable for their unconventional nature.
On Wednesday, Brennan’s legal team warned the Trump administration of their intended defense strategy. They filed a lawsuit in the Federal District Court in Washington. The suit requests a court order compelling President Trump and Justice Department officials to preserve records related to the investigations.
The preservation of materials is intended to support a future motion alleging vindictive prosecution. Such a motion could be filed if charges against Brennan are pursued.
This request for record preservation, even before the case is officially filed, highlights the unusual nature of the issues surrounding Brennan. Trump’s aggressive legal actions against his adversaries have met with equally robust responses from defense lawyers at early stages of investigations.
The inquiries into Brennan appeared to prioritize him as a target prior to identifying specific charges. This approach has led to two primary legal theories being explored.
One investigation is based in Washington. It examines whether Brennan misled Congress about his involvement in a January 2017 intelligence report. This report concluded that Russia aimed to assist Trump’s 2016 election campaign.

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