From the Times article:

"Mr. Kelly’s directives would also instruct Immigration and Customs Enforcement, as well as Customs and Border Protection, the parent agency of the Border Patrol, to begin reviving a program that recruits local police officers and sheriff’s deputies to help with deportation, effectively making them de facto immigration agents. The effort, called the 287g program, was scaled back during the Obama administration.
The program faces resistance from many states and dozens of so-called sanctuary cities, which have refused to allow their law enforcement workers to help round up undocumented individuals."

In the draft of the 287g program the National Guard was also included....and met with resistance...but it's a frightening trend....considering Trump.