By the time his term of office ends on January 20, 2021, Donald Trump will have reduced immigration to the United States by more than half. He has managed to accomplish all of this through executive order and regulatory changes, without any change in statutory law — and therefore no need for cooperation from Congress. The timing of this decrease in immigration makes it obvious that nowhere near all of it can be attributed to the COVID-19 crisis.
The administration has erected so many walls against immigration, both literally and figuratively, that it would be impossible to list them all succinctly. All told, Trump issued more than 400 executive orders and actions, each of them with significant impact. Some of the highlights (or, perhaps better put, lowlights) are listed below.