There were at least one and probably several investigations implicating trump
ITS NOT THE FOUR YEAR OLD COUNTERINTELLIGENCE INVESTIGATION INTRO TRUMP WE NEED TO BE MOST WORRIED ABOUT ITS THE ONES BILL BARR MAY HAVE KILLED
https://www.emptywheel.net/2020/09/02/its-not-the-four-year-old-counterintelligence-investigation-we-need-to-be-most-worried-about-its-the-ones-barr-may-have-killed/
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Still, theres something still more urgent, one that is getting lost in the debate about what happened three or four years ago.
There were, as of at least April, at least one and probably several investigations implicating counterintelligence tied to Trump, through his top associates. But they tie to the same cases that Billy Barr has undermined in systematic and unprecedented fashion in recent months. It is a far more pressing question whether Barr has undermined counterintelligence investigations implicating Trumps ties to Russia by ensuring those who lied to protect him during the Mueller investigation face no consequences than what Rod Rosenstein did forty months ago
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Its not clear whether John Ratcliffe, Barr, or the IC made the decision, the redaction process of the SSCI report denied voters the ability to know how closely tied Trumps campaign manager is with the people who helped steal the election. What we do know is the effort Manafort started continues in Trumps efforts to extort Ukraine and spew Russian disinformation.
For all three of the Trump associates where we know Barr intervened (theres good reason to suspect he intervened in an Erik Prince prosecution, too), those people implicate Trump directly in counterintelligence investigations that were, fairly recently, ongoing.