Cool. Excellent, even. This is big news.
But I don’t need an announcement that you’re going to be making an announcement. Just announce your progress. “I’m going to say something on Monday!” isn’t news worthy, just tell me on Monday what he said.
This drives me absolutely nuts in news of all sorts.
That announcement of the announcement is probably not for you and me, but for the press so they can prepare and send the journalists who are familiar with the topic.
Thank you for the context, that makes perfect sense.
It’s how they soften the ground and gauge reaction. He needs to tell a bunch of people in Congress and the Judiciary what he wants to do, so it’s going to leak that he’s going to say something. Better to leak what you want people to know, and then if details spill through some cracks here and there, it’s less of a story.