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

The plan, called “Operation Safeguard” by Immigration and Customs Enforcement, would start on Tuesday, the day after Mr. Trump is inaugurated, and last until the following Monday, according to the people familiar with it and the correspondence. The dates were still being finalized, however, and could change.

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