Here's a representative news article about it (WaPo because they were first in the search results): https://www.washingtonpost.com/immigration/2026/01/22/ice-me... (paywall-avoiding: https://archive.is/bsdv9)

They've come up with a memo saying that non-judicial warrants can let them break in. This has historically been very much not allowed.

Edit: As a quick explanation, this is more or less a separation-of-powers thing. The rule has been that for the executive to enter someone's home they need a warrant from a judge, a member of the judicial branch. They now say that an "administrative warrant" is enough, issued by an immigration judge -- but immigration judges are just executive branch employees, so this is saying that the executive can decide on its own when it wants to break into your house.