Yes it is illegal for you to do that, as it would be for Trump. But no, Trumps proposed 5k checks to all adult citizens, as I understand it, is legal. I’m pretty disappointed in the other answers. A few relevant points.
Remember the model for sending checks to folks: CARES. Both Biden and Trump have previously done this.
Congress can legally amend and pass laws. Note that the law that makes bribing for votes illegal is not in the constitution, so it requires only the usual legal action to amend it.
I note that the policy Trump proposed isn’t discriminatory on who you vote for; your hypothetical does. (I suspect this is irrelevant for the legality, but certainly helps the optics.)
Yes it is illegal for you to do that, as it would be for Trump. But no, Trumps proposed 5k checks to all adult citizens, as I understand it, is legal. I’m pretty disappointed in the other answers. A few relevant points.