The English language. "Never" means "never," as in not even supporting or voting for Trump in the general election against Hillary.
Otherwise, a conservative who did not support Trump in the primaries but did in the general--it would be more accurate to describe such a person as a "ReluctantTrumper."
Levin was in fact a #nevertrumper. He’s changed his spots because it’s all fairweather to do so. He’s earned himself a position of lifetime probation in my book. He’s no better than Glenn Beck who totally destroyed his own career and empire in a very embarrassing display of TDS.