There's a pretty good chance Trump will blow through the debt ceiling just because he's a senile old man who wants to watch the world burn. I don't actually know if blowing through the debt ceiling and shutting down the government and then not making bond payments is actually the apocalyptic event we imagine it could be (shutting down the government is Bad, but as for the All Powerful Bond Markets ????), but Trump is gonna Make America Great Again even if that means destroying it.