There's also a more basic answer to why US debt got more expensive. There is no such thing as a "trade deficit". You cannot import something without exporting something else. That something else, in almost 100% of the situations, is dollars. What do you do with dollars, if there's nothing you want to buy? You buy debt. So, every trade deficit ultimately tends to export debt. We have long known that government debt is proportional to trade deficits.
The problem with tariffs, in this context, is that they are being used as a signal that we don't want to sell people dollars anymore, explicitly saying "no more trade deficits". In doing so we are choking off the supply of dollars used to buy debt (rather abruptly), so that US debt is chasing fewer dollars and has to give a bigger yield as a result.
What's worse, is that because we are signalling that the tariffs are meant to be permanent, and we're seeing reciprocal tariffs as a result. When that happens, it means that using dollars in the future will purchase fewer US goods, so the time discount of money has gone up too. Further driving up yields to make bonds attractive enough to sell.