The Trump administration is increasingly warning that if local law enforcement agencies don't cooperate with federal immigration officials, they could lose federal funding.
"A nation without borders is not a nation," Trump said.
It's been a Trump policy, signed in January in an executive order.
Attention lately is heightened after two Maryland high school students, including one here without papers, were accused of raping a classmate in a school bathroom. Henry Sanchez-Milian's lawyer says he is pleading not guilty.
Maryland lawmakers are considering a bill restricting how much local law enforcement can share with federal agencies.
"I would plead with the people of Maryland to understand that this makes the state of Maryland more at risk for violence and crime," Sessions said.
New York's rules limit cooperation with immigration agents. They don't end it. And its backers add the rules aren't just constitutionally sound, but make the city about the safest its been in generations.
Taking away federal funding jeopardizes that, they say. Not to mention, some of that money Trump is threatening to take helps protect his namesake tower.