The writer of the letter is a traitor, not someone to be admired. The country followed the process and voted in Trump as the leader of the free world. That would mean that LOTS of people are interested in his plans and point of view, If you chose to be on his staff you need to support his efforts.
I believe a lot more would have been accomplished by now if these silly distractions would go away and he could just focus on the job. I think he'd also realize he needs to change some of his staff if he worked on real problems with them. Alas, you guys aren't going to let that happen so even though the economy will remain strong through his 4 year term, very little will be accomplished.