New Jersey's sanctuary state status challenges Trump's mass deportation plan, setting the stage for a contentious battle over immigration policies.

President Trump has announced plans for what he calls the largest deportation operation in U.S. history, targeting sanctuary cities where undocumented immigrants are supposed to be protected from deportation.

State and local leaders across the country are bracing for a tidal wave of aggressive immigration policies and possible mass deportations that President Donald Trump has vowed to enact in the hours and days following his inauguration Monday.