POTUS can send them all engraved invitations to attend. If they aren't going to host him, he can host them. Easy. Plus give it to them in writing (once he has delivered it orally first).
It will take the Dems about 15 minutes to find a District Court judge to issue a global injunction to halt any planned firings. They can stop damned near anything this way, at least until such time as the Supreme Court deems to address the matter.
We're still waiting on DACA. That's been a whole lot longer than 3 days, and no end in sight. It's why POTUS is unwilling to include DACA concession in negotiations, because a lower court has ruled the entire program is legal (although it isn't, for a couple of reasons).
He calls out the deep state every damned day. He even calls the media clowns.
Don't know where they get their material, but Epoch Times has been breaking a lot of interesting stories the last little while.