I dont think Trump ever cracked 80% support with Republican voters. There still are a sizable chunk of Romney type Republicans who would never support Trump.
Donald Trump was was far over 80% with Republican voters on November 8. Over 90%, actually. For whatever reason, they "came home".
That's what helped him win was his ability to get 90% of Republicans to vote for him.
I see no reason for any significant percentage of the voters to have any taste for the criminal coup that the Democrats—and Swamp-dweller Republicans—are trying to pull off against President Trump.
The Swamp-slime Democrats and Media (but I repeat myself)—not to mention the SwampGOP—will fail. Miserably. And there's going to be a lot of clenched jaws on our side until they do fail. But they have nothing. Don't forget that. That's not going to change.