That would be the Rasmussen Poll on 5 December which entirely by coincidence was the only recent poll that Trump tweeted about. Perhaps you saw it there?
Anyway here is a Fox News Poll that he hasn't tweeted about, though in fairness he no longer thinks they are the arselicks they used to be, that say that 50% of Americans want Trump impeached and removed. If apparently 52% of people approve of his there must be a load of confused Americans out there.
https://thehill.com/homenews/adminis...d-be-impeached
That said if you were to discount that low accuracy rated poll and take the five38 stuff posted earlier that has a disapproval rating of 53% then things become a little more rational.