If Biden is anything to go by, it's not really a given that a Dem president will necessarily undo Trump's international policy. He didn't get back in the negotiation room with Iran, he didn't back out of the Afghanistan pull-out, he made zero progress on climate change, he didn't undo much of the immigration policy changes that occurred... One of the few things that he DID pull back on were Trump's first-term tariffs (EDIT: Wait, he did pull back, didn't in he? I thought he did, I might be wrong.), and come 2028, if there's been substantial domestic change taken with the assumption of their longevity, I personally don't trust Democrats to back off on them.