As Eli Lake of Bloomberg perceptively observed, President Trump isn't trying to silence Brennan by revoking his security clearance, as the former CIA director's defenders insist, but elevate him as a foil.
Trump couldn't hope for a better poster boy for the so-called deep state than a former CIA director who immediately began to sound like a commentator for MSNBC upon leaving government — and, indeed, signed up as a commentator for MSNBC.
It has been the usual practice of former top intelligence professionals to keep their political opinions, and especially their wild-eyed rants, to themselves. They understand that, having been entrusted with some of the most sensitive powers of the United States government, they should show forbearance and restraint lest they undermine the reputations of their institutions.