Such a series of signatures by Clapper and Brennan explains WHY the FBI-CIA-NSA are so reluctant to release the entire Mueller report -> The redacted words (literally) cover up the “foreign intelligence” sources that served to coverup the original FBI-CIA creation of their “evidence”.
But notice that this memoradum was signed as the Trup-Russia collusion conspiracy setup was being closed out, not before it started in 2015-2016!
Wait, how could these guys sign as the case was being “closed out?” They were gone by then.