Donald Trump tried to punish sanctuary cities. Its backfiring.

[Mr.Bill]

11. What happens is

let's say a guy gets arrested for shoplifting and the judge gives him 30 days. and he is an undocumented alien. After he serves his 30 days, the local Law Enforcement authorities have no legal reason to keep in jail.

The feds want these people held but they won't always issue a warrant. I know specifically that San Francisco has told the feds, just issue a warrant and we will hold him until you pick him up. There have been cases in other cities where these people have been held without a warrant, sued the jurisdiction and won large settlements. Most sanctuary cities became so on advice of their legal counsel to avoid these lawsuits.