Trump often doesn’t care about actually convicting someone he says is a criminal. He often doesn’t care about passing specific laws. He often doesn’t care if what he is saying is true. He wants something that creates the illusion of truth so he can refer to it, argue its true, and dupes will fall for it. Whether the SAVE bill becomes law or not, Trump can refer to him getting screwed and blame Congressmen and illegals for bad elections. The truth of Obama’s birth certificate didn’t matter, as long as it got a lot of coverage and Trump got it in people’s minds. Trump wanted Zelenskyy to say he was investigating Biden so Trump could point to that and accuse Biden of shit.