One of the most humiliating journalism debacles of the Trump era played out on December 8, 2017, first on CNN and then on MSNBC. The spectacle kicked off when CNN announced that anonymous sources had provided the network with a smoking gun proving the Trump/Russia conspiracy once and for all: during the 2016 campaign, Donald Trump, Jr. had received a September 4 email with a secret encryption key that gave him advanced access to WikiLeaks’ servers containing the DNC emails which the group would subsequently release to the public ten days later.

The claim was completely false in its most crucial respect. CNN misreported the date of the smoking gun email Trump, Jr. received: rather than being sent to him on September 4 — ten days prior to WikiLeaks’ public release, thus enabling secret access — the email was merely sent by a random member of the public after the public release by WikiLeaks (September 14), encouraging Trump, Jr. to look at those now-public emails.

Very shortly after CNN unveiled its false story, MSNBC’s intelligence community spokesman Ken Dilanian went on air and breathlessly announced that he had obtained independent confirmation that the CNN story was true.

Dilanian then proceeded to explain what he had learned:

"That’s right, Hallie. Two sources with direct knowledge of this are telling us that Congressional investigators have obtained an email from a man named “Mike Erickson” — obviously they don’t know if that’s his real name — offering Donald Trump and his son Donald Trump, Jr. access to WikiLeaks documents… It goes to the heart of the collusion question….. One of the big questions is: did call the FBI?"

How could that happen? How could MSNBC purport to confirm a false story from CNN? Shortly after, CBS News also purported to have “confirmed” the same false story: that Trump, Jr. received advanced access to the WikiLeaks documents.