The letter is the latest (of many) canary trap. Intended to expose a leak channel and set participants up fir prosecution.
or
The letter is a deep state member lashing out in response to Durham shifting his focus to the Pentagon last week. Remember, six high ranking Pentagon officials have resigned in the past seven days, including the chief of staff yesterday.
I’m gonna make two guesses on this.
or
That many resignations means the alternative was Gitmo.
I'm going to say based on the recent resignations, it was likely the former.
I was just thinking canary trap.
Gotta be. It wouldn’t be the first time, and it’s hilarious how stupid the leakers are.