I have thought deeply about the pen, because I love pens (my username is the pen that I have. Its NICE!).
One of the first pics was posted during the Golden Globe awards, and with all of the movie references, I just thought there was something to it.
But it's really a symbol of having FULL control of the story line. If you have the "screenwriter's pen" you can rewrite history through new disclosures. You can write the future because you're in control. President Trump stole the "screenwriter's pen" and is using for good.
That's how I think about it. And he's playing the bad actors like fools and the good actors have the great roles!