There has never been any kind of special relationship.
When they talk about the special relationship in the media, its entirely a delusion of the British ruling class. A kind of post-empire needing to see ourselves as BFF to the world's most powerful country.
Ask any American about the 'special relationship' they they have never heard of it. Precious yank president humoured us from time to time because it cost them nothing. Why would be a more valuable ally to the old America than Germany or France? They speak their language and they liked Harry Potter but that does not make us special.
What has changed is that the US no longer sees Britain or anyone in Europe as any kind of ally. Its crude power politics.