Aut cum scuto aut in scuto
If he truly is the first to do this, and it works, he won't be the last. Every President from here on will also file on the day of their inauguration. It's a brilliant move and it tells you that he is surrounded by smart people reading every last word in every law. That bodes well for everything else he's trying to do, it means far fewer opportunities for the courts to overturn his actions if his team knows what they are doing.