IMHO I think he is going to point out what is happening at the border; i.e., illegal crossings, caravans, terrorists, MS-13, drug cartel, etc., and then announce he is declaring a National Emergency.
He declares a national emergency and Pelosi and Chuckie try to scoff at him they will look like utter fools, especially when the next caravan shows up or God forbid a border agent is harmed or killed.