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Nor does he or ever did have the support of "(over) half the country". His maximum approval level in 2025 was at the beginning of his term at 47% "approve" and is currently around 36%, according to the Gallup poll.
The popular vote does not matter in the US. The electoral college matters.
(Also, "non-negative" is carrying a lot of weight, since both Trump in his first term and George W. Bush in his first lost the popular vote. The idea that a wide majority of the country is conservative, let alone MAGA, is risible.)
It was under half of the voters in the election itself as well. He won with a plurality, not a majority.