Also this via @LilySAxelrod. Obviously we need more details about what it means but:

One exec order today was federal hiring freeze. It's going to be hard to deport millions w/o more judges, deport officers, & ICE attorneys.

Immigration courts are so backlogged that some hearings are set for 2020 and 2021. Fed hiring freeze = ppl arrested now could out-wait Trump

If fed hiring freeze slows down immigration courts, ICE attorneys will have to close more low-priority cases, just like under Obama.