hmmmm?
bogus?
The Atlantic Council’s Digital Forensics Research Lab was able to pin down the origin of this particular piece of disinformation, which turned out to be — as with so many other hoaxes — 4chan:
There is a glaring initial tell that this document might be a hoax: It’s written in American English rather than its British counterpart. To be more specific, the language used in this letter sounds like an American interpretation of British cadence. It also has sentence fragments and misplaced punctuation that would not pass muster as an official document, even an internal one.
The details in this letter also collapse under the tiniest amount of scrutiny. For one thing, its author confuses former Republican National Committee chair Michael Steele with Christopher Steele, the former British intelligence officer who produced the document now known as the Steele dossier, which detailed information about and allegations against Donald Trump.
Further, Christopher (not Michael) Steele was a former MI6 agent, not MI5. This is significant not just because it is a basic and glaring error, but because MI5 deals with security issues and threats within Britain, whereas MI6 focuses on foreign rather than domestic concerns.
Finally, the header and signature have been lifted from a real document to give it a sheen of respectability — former GCHQ director Robert Hannigan’s January 2017 resignation letter (note the seal at the bottom of the page and the comparative sloppiness in the faked document):
https://www.truthorfiction.com/does-a-leaked-british-intelligence-document-prove-trump-wiretapping-claims/