Barr was on CBS last night...
"So there was no mystery about the call. But they initially tried some theories of how they could open another investigation, which didn't fly. And then they found out that they had not technically closed the earlier investigation. And they kept it open for the express purpose of trying to catch, lay a perjury trap for General Flynn.
They didn't warn him, the way we usually would be required by the Department. They bypassed the Justice Department. They bypassed the protocols at the White House and so forth. These were things that persuaded me that there was not a legitimate counterintelligence investigation going on."
https://www.realclearpolitics.com/video/2020/05/07/barr_on_flynn_i_am_doing_the_laws_bidding_i_want_to_restore_confidence_in_the_system.html