...it's probably not formally illegal, as the freeper below notes, because Clinton did it too, and Clinton was a bad man who had sex.

But seriously, it's doubtful that the illegal resident broke any laws with this. A slap in the face of the Senate, yes, which is never a good idea when you're at 28% in the polls, the country wants you to just go away, and you need a budget passed. But illegal, probably not.