https://www.cbsnews.com/news/what-records-show-about-migrants-sent-to-salvadoran-prison-60-minutes-transcript/
I know users here don't believe they should be here in the first place to which I agree but from an optics perspective this isn't great for Trump and anti immigrant action in the US if leftists are able to effectively weaponize it. Deporting them is one thing (I'm not sure on the mechanics of it but surely it can be done without sending them to El Salvador) but sending them to the prison in El Salvador on accusations of being gang members is something that can be easily exploited and is immoral.
Breaking into a foreign country is immoral, protecting your country is not immoral.