Leaders of several sanctuary cities where officials had prominently rejected Trump’s first-term immigration policies are shifting their tone.

Donald Trump has pledged to carry out, as president, the largest deportation effort in US history, vowing to ultimately deport all of the foreigners living in the country without permission. They are thought to number at least 11 million,

The size of the planned immigration raids is unclear, but they would be the opening step in the president-elect’s goal of overseeing the largest deportation program in history.