It's dumb because Trump uttered the word "potato"? That's a crazy position in an of it self.
I think that one of the reasons Trump got elected is that A LOT of citizens were sick of hearing lofty speeches with perfect syntax, AND THEN NOTHING GETS DONE. We've heard for 2 presidencies that Clinton's 'great' China deal was actually a BAD deal, and that we were getting ripped off WITH NOTHING BEING DONE about it. That's 16+ years if you count the years China ripped us off during the Clinton presidency! And that means that they are stupid, cowardly, or in on the rip off.
And do you think that what's going on in Virginia isn't crazy? Oh, they actually aren't trying to infringe on the 2nd Amendment? ... Because that's the substance of what Trump said. And then, he tags a little joke on the end, but That's the real problem?
It's actually pretty simple. When Trump speaks don't listen to the words. Because he isn't looking for points in English Composition. He is DOING something. He is placing a stone on a Go board. (by the way, I tried a bit to find the entire clip for context but was unsuccessful)...
Most of us know that the word potato(es) is often used when referring to someone's hind quarters, e.g. "sack of potatoes". So if you substitute in kind you get:
"You'll have nobody guarding your ass."
And I'm sure that you know that that is exactly what the 2nd Amendment is all about.