From The Washington Post:
It was only a matter of time until Donald Trump converted the debate over covid-19 vaccines into an occasion for his supporters to show their loyalty to him — and even worse, to the “big lie” that his 2020 loss was illegitimate.
“People are refusing to take the Vaccine because they don’t trust his Administration,” the former president said in a statement Sunday, referring to President Biden. “They don’t trust the Election results, and they certainly don’t trust the Fake News.”
There you have it: Trump is telling his supporters that they are correct not to trust the federal government on vaccines, because this sentiment should flow naturally from their suspicion that the election was stolen from him. Expressing the former has been magically transformed into a way to show fealty to the latter.