Stop listening to right wing outlets for a couple days, just as an experiment. I have never heard any Democrat official saying they want open borders. That's a straw man concocted by talking heads. Even arguably the most vocal immigration advocate AOC says
Ok, but what exactly does that mean, because even i'm confused. You can't on one hand say "We don't want open borders", and then on the same breath cry and complain when authorities continue to apprehend illegals, saying that "these people are only coming to seek better lives". Well of course they are, and we should tell them to follow the right steps to do that.
Republicans do have a point here, where when Obama apprehended and deported twice as many illegals, there wasn't even a peep from democrats, but now as Trump is doing the same (much less actually), it's a national tragedy, which leads me to think this is mostly about politics.