$20T @ 2% = $400B. 2% is a below average rate.
Avg rate is 5%.
$20T @ 5% = $1T.
5% is an average rate. The rate could go higher in the next 10 years.
And that is without borrowing a single extra dollar - simply based on current debt (actually - the figure is now higher).
Only around $15T is “public” - meaning outside of intra-governmental loans (like the Social Security “trust fund” that Congress spends out of illegally)
Supposedly - current year debt interest being paid out by Federal Government is between $300-400 BILLION -