'Sanctuary' city mayor vows she will defy Trump's mass deportation push: 'Causing widespread fear'

"Elections have consequences, and the federal government is responsible for a certain set of actions, and cities, no individual city, can reverse or override some parts of that," she said. "But what we can do is make sure that we are doing our part to protect our residents in every possible way, that we are not cooperating with those efforts that actually threaten the safety of everyone by causing widespread fear and and having large scale economic impact."

"And then we are providing the spaces to reach out directly to our residents, because the last thing we want is for people who are part of our economy, part of our school system, part of our community and the fabric of our city, to feel that all of a sudden they have to retreat into the shadows with because of fear that reaching out to city services, whether it's calling 911, when you need it, or taking your child to school, those are all city services that have nothing to do with immigration enforcement, and we will continue to protect our residents within those spaces," she said.

Trump made a mass deportation operation a centerpiece of his campaign and on Monday said he was open to declaring a national emergency and using military assets.

But there is already brewing resistance from blue cities and states, including those that are "sanctuary" cities - meaning they do not cooperate with ICE requests that detained illegal immigrants with criminal charges or convictions be transferred to ICE custody.

Massachusetts Gov. Maura Healey said she is prepared to use "every tool in the tool box" to protect its citizens and residents and vowed that state police would "absolutely not" assist Trump in the operation.

ICE announced this month that it apprehended a Colombian illegal immigrant, who had been arrested on charges of enticing a child under 16, distribution of obscene matter, and lascivious posing and exhibiting a child in the nude. ICE had filed a detainer against him, but it was ignored, the agency said.

In March, Fox News embedded with ICE officers in Boston and saw them make five arrests, including four alleged child rapists and a member of MS-13, a group of potential dangerous criminals the officers say were allowed on the streets because of local sanctuary policies that denied the agency's detainer requests.

"If you don't want to work with us, then get the hell out all the way. We're going to do it. What it means is, rather than send 100 people to Boston, we're going to send 200 agents to Boston. We're going to get the job done," he said.