Read the article below regarding Obama doing this before Trump (and GW Bush before him):
https://rewire.news/article/2018/05/08/jeff-sessions-separated-immigrant-families-obama/
You can read a good summary of the program – and why the current arguments against it lack continuity below:
Rich Lowry writes in the National Review online. You can read that article below:
https://www.nationalreview.com/2018/05/illegal-immigration-enforcement-separating-kids-at-border/