Immigration policy being at the forefront of politics is nothing new. From the nation’s founding to modern day, the policies enacted over time reveal shifting priorities. Now, President Donald Trump is using old measures to accomplish his agenda.

The US sued four “sanctuary cities” in New Jersey, claiming they are blocking the work of federal immigration officials, as the Trump administration seeks to remove obstacles to its mass deportation plans.

The Trump administration carved out an exception to its refugee ban for white South Africans. But other groups, including Afghans who helped U.S. forces during the war in their country, are being shut out.