That is correct in the external debt - and that would take about $1 Trillion surplus per year.
But Trump has no specifics and relies on the growth that his trade deals would produce. This is mathematically impossible.
Trump: Get Rand Paul to explain the Tea Party budget to you.
The biggest way to save money is to do away with entitlements. However that’s the easiest way to lose the congress in 2018. There are no easily fixings for sure.