It's 1D chess, really, and it isn't really Trump who came up with the idea. We're between a rock and a hard place. If we refinanced at 4.8%, the interest payment would go to $1.2T per year. If we refinance at a lower rate, it's lower. Note that we're not just refinancing either, we'll have to borrow about $1.8T, too, unless DOGE miraculously achieves its $1T/yr savings (doesn't look like it will, if the current trends are anything to go by). Tariff revenues would help to plug that hole somewhat. Then there's the issue of many countries having higher tariffs for our stuff than we have for theirs. That's not "free" trade. Then, finally, there's the issue of the near-irreversible erosion of the industrial base.
Warren Buffett warned about this back in 2003, and proposed an elegant solution, which, unfortunately, would require Congress to implement it through legislation: https://faculty.washington.edu/ss1110/IF/Buffett%20Fortune%2... But we do not have a functioning congress, so Buffett's solution is impossible.