It's worth noting that a lot of children held separately were brought into the country not by relations. Beyond this a huge number of those children have been reunited. Note that this is separate from those children separated from parents that are being charged and prosecuted, much like any other crime. Also, most of these policies were started under Obama or previously. Personally, I think that illegal border crossings should be prosecuted.
On the flip side, I also feel that work visas should be granted under a very few limitations centered around having a job and place to live lined up along with English proficiency and/or enrollment in an ESL program. This should be combined with requiring that a company with work visas employ no more than 25% of staff on work visas and that the average pay matches the company's average pay as a whole. Under those conditions the issue could mostly self-regulate in terms of the rate of immigration vs. a sustainable level.