Actually, I didn't say anything about enforcing immigration law. We're talking about deportation orders which are handled by the US Department of Justice, Executive Office of Immigration Review, under the responsibility of the Attorney General of the United States.
Apparently you and some others don't understand that DHS and the President have nothing to do with deportation orders that require a hearing, or those that don't that are appealed, those are all handled through a judicial review process by our dear friend, Jeff Sessions.
So when you are complaining about low deportation numbers, you are actually complaining about the poor performance of Jeff Sessions at the US Department of Justice.
Arrests are up thanks to DHS, but deportations of those arrested are down because of DOJ. Sessions is working to hire more immigration prosecutors and immigration judges, but with existing personnel, there has been a decline in deportations when we all would have expected a speeding up of the process and an increase in deportations.
There may be some explanation for the oddity. Maybe now that everyone watching realizes where the problem is which is not the White House or DHS, and who is actually responsible for it, which is not Trump, something can be done to fix it.
https://www.justice.gov/eoir