Traditional American foreign policy is dead. The President of the United States is now fundamentally hostile to the institutional structure of traditional American diplomacy, from his own State Department and intelligence agencies to international organizations like NATO and the WTO that the US has traditionally championed. Republican elected officials are broadly okay with this, believing it to be a worthwhile trade for its economic and social agenda. And the Republican base thinks it’s awesome, or, at minimum, an acceptable tradeoff for other priorities. So, now what?
The current liberal foreign policy agenda is primarily defensive, an attempt to preserve what is already lost. This is doomed to failure. The rest of the world knows there are going to be future Republican presidents. The GOP was only in exile for one presidential term after Watergate. George W. Bush started a war of aggression based on a lie and served two terms and the Democrats still only had a united government from 2008-2010. Iran-Contra, possibly the closest analogy to the nebulous Trump-Russia scandal, led to no negative electoral consequences for Reagan at all. And given where the GOP base is, they’re highly likely to nominate candidates in the Trumpian mold for the foreseeable future. Thus, unless drastic measures are taken, the next Republican president will take another chunk out of the “Rules-Based Liberal Order” and the next one yet another until there’s nothing to defend at all.