I.C.E. is not rounding up migrants. I.C.E. is rounding up criminals.
ICE is rounding up migrants. However, they are not being arrested and deported for solely being a migrant.
Let's define what the word "migrant" means. A migrant is simply a person moving from place to place (country, money, environment, etc.). That's it. Nothing to do with legal status. Plenty of people are migrants that are in the country legally and are not criminals.
These terms are distinctive and important. Bad actors try to mish mash the terms to get us to use them interchangeably for evil intentions. It's decades in the making so the masses wouldn't know the difference and the perpetuators would wield these labels as a weapon against population.
It's been rather effective up until several years ago. I think we all know why that is.