Trump: Deport without 'judges or court cases'
https://edition.cnn.com/2018/06/24/politics/ron-johnson-immigration-cnntv/index.html
This is not the thing that happens in countries regulated by law.
If he concerns about illegal immigration, he should think about how to strengthen border check.
Building walls would be one of the measures for that.
Though I didn't feel good when he referred to building walls, it would be better than deporting without legal procedure.