If trump plans to continue as president indefinitely, he will need an army. He is now building one out of ICE, and aggressively recruiting from the population most likely to support him-- uneducated, broke, gun-loving men who believe they’ve been marginalized. TV commercials recruiting ICE agents are running, promising a $50,000 signing bonus, $60,000 student loan repayment.
He’s been largely using executive orders to do things; they allow a president to modify or change how a law is being interpreted or implemented, but don’t allow him to create new things out of whole cloth (which would take an act of Congress).
ICE and ICE agents already exist. This seems to be about changes to their mission, and changes to their hiring program.