Trust won't come back immediately, but if the next 2 to 3 Presidents are "normal" then trust will come back slowly.
Countries cannot put their economic and physical security in the hands of a few thousand mouthbreathers in Pennsylvania or Wisconsin every 4 years.
Europe is rearming and talking about a continental nuclear shield. China is selling US Treasuries.
Middle powers like Canada that do not wish to become a U.S. protectorate are looking hard at what is needed to secure their futures.
A President Newsom, though a welcome change, does nothing to reverse these vectors now that they have been started.
The times to stop this were Nov 5, 2024 and Nov 8, 2016.