Trump left office on January 20, 2021. Biden mandated the vaccine on the wider population. Trump did not.
Trump’s admin implemented the killer hospital protocols and incentives, gave the EUA order that put all this under the military, took away all liability and disclosure, and removed all requirements for standard testing for safety.
Trump’s CDC made all sorts of dreadful “recommendations” that states and companies made policy by a matter of policy.
Then, long out of office, he kept promoting them despite all the evidence of death and dire harm that those around him kept bringing to him.