Some articles about Trump's immigration policy, the history of immigration in the US, statistics and how Trump differs from past presidents on immigration.
A 5-minute podcast about the history of immigration policy beginning with Carter.
https://www.pri.org/node/183033/popout
That podcast is expounded upon in this article.
https://www.pri.org/stories/2019-07-12/trumps-hard-line-immigration-policies-build-history-former-us-presidents
As Trump clamps down on refugees, centers that assist refugees with resettlement are forced to close.
https://www.pri.org/stories/2019-09-27/us-refugee-agencies-wither-trump-administration-cuts-numbers-historic-lows
https://www.wsj.com/articles/why-trump-has-deported-fewer-immigrants-than-obama-11564824601