I think immigration is a net positive for the US, but I also think we need to secure the southern border to a better extent.
I don't think it can be completely secure, ever, no matter what.
Having people turn themselves in and request asylum and being turned loose into the hinterlands without the ability to work legally is a disaster, in my view. We see plenty of city mayors agreeing with that.
Some of this can be influenced with Presidential verbiage, symbolic steps and words. Some needs new legislation. Some needs current laws being enforced to a better degree. (If an illegal is connected to a crime and convicted, I think he should be summarily turned over to ICE and removed.)