You said federal employee though. Ask anyone who works for a federal court and ask them where their paycheck comes from. Answer, the federal government, who gets that money specifically from the US Treasury department, who gets its money from taxpayers.

You really think that the Biden administration feels they have the legal authority to mandate private companies who happen to employ an arbitrary number of employees to force their employees to get injected against their will or be fired yet not mandate the same for federal employees of the other two branches of government?