If he does not cut spending, and renegotiates all the debt, then our credit rating gets shot, so how is he going to borrow more to pay the current deficit? I suppose he could just have the Fed buy all the new debt and wait for the hyperinflation.
BTW, the Fed is buying most of the new issues right now, which means he could bankrupt the Fed (and by extension, most of the banks in the country) by discounting treasuries.
And, yes, this is the way Trump does business.