I doubt "until the administration ceases to act insane" is going to be enough. The current administration has proven to be untrustworthy, so nothing they say is going to restore trust in the US. On top of that, what guarantees could the US give that a future Trump 2.0 isn't going to break on their first day?

The problem is systemic: The US doesn't have a functioning democracy. FPTP, gerrymandering, unchecked campaign financing, the electoral college? It just isn't working, and the US is permanently stuck in a dysfunctional two-party system. If that doesn't get fixed (and let's be honest, it won't), the rest of the world won't be trusting the US until it can demonstrate a few decades of continuous trustworthy leadership after Trump is gone.