I wonder if he has spoken to his sons, who are much more "gun folk" than their dad.
One thing about Trump is how he can and will change his mind when presented with a compelling argument. That's our best approach here.
My two cents...
I respectfully disagree. Trump is many things, but naïve is not one of them. He knows what he’s doing. He’s a winner and wants to win this November and in 2020 (hint: it won’t be at the expense of the Second Amendment).
Can’t see where bump stocks are good for anything but spraying a lot of inaccurate rounds down range...hate to see them outlawed but won’t stop supporting Trump unless he starts thinking about firearms in general....way too much at stake to worry about what amounts to a “hold muh beer and watch this” novelty.
He's definitely wrong as regards the bump stocks though.
When we give-up any 2A right, we embolden the left to demand more and more.