Immigration and Customs Enforcement officials are planning a major enforcement operation to target immigrants in the days after President-elect Donald Trump takes office, according to NBC News and a person familiar with the matter.

Multiple locations in Chicago will be targeted, said the person, who spoke on condition of anonymity because he was not authorized to discuss the operation.

The operation is expected to begin as early as Tuesday and end next Monday, according to the document, but the date could change.

ICE officials referred NBC News to the Trump transition team for comment, which did not immediately respond to a request for comment.

A briefing for agents planning to take part in the operation, known as Operation Safeguard, is planned for Friday afternoon in Chicago, the document said. It also said the operation would involve agents who have been asked to volunteer their services, and there are more agents volunteering than are needed.

The Wall Street Journal first reported that the operation was expected to take place in Chicago.

It is also possible to conduct business in other cities. Before NBC News reviewed the document, several sources familiar with the plan said major metropolitan areas that could see early enforcement action include Washington, D.C., Philadelphia, Los Angeles, Denver and Chicago.

As a candidate, Trump promised the largest deportations in U.S. history. Federal estimates suggest that as many as 11 million undocumented immigrants will be living in the United States in 2022, but the exact number is currently unclear.

The American Immigration Council, a pro-immigration group, estimates that deporting them all could cost at least $315 billion. Beyond costs, experts warn that mass deportations could raise the price of some goods in the United States. The federal government estimates that 40 percent of agricultural workers are undocumented immigrants.

ICE currently has a $230 million budget shortfall and does not have enough funds to implement Trump's plan on a broad, long-term basis. Congress must first allocate additional funding for law enforcement operations and detention facilities.

When immigrants are arrested, they are detained before being deported. According to ICE's website, there are currently no beds available at its detention facility in Chicago.

Tom Homan, Trump's incoming border czar, has said he wants at least 100,000 detention beds across the country; currently, there are about 34,000 in the United States. The highest number of deportations in a single year during Trump's first term was 267,000 in fiscal year 2019.

The Biden administration is deporting more people each year than the first Trump administration deported during its first term. In fiscal year 2013, during the Obama administration, the highest number of deportations in the United States in a single year was 438,000.

Trump's apparent plans to target Democratic-run cities are also likely to face political pushback. Responding to reports that the new administration may initiate deportations in Chicago, Illinois Governor J.B. Pritzker said Friday that he will protect immigrants if they are illegally arrested.

“We have laws that protect undocumented people,” Pritzker said. "I will make sure the law is followed. I am concerned that the Trump administration and his lackeys will not follow the law."

Homan told NBC News the new administration is willing to shoulder the financial costs of political battles and mass evictions. "I think mass deportations and the consequences of mass deportations matter more to this country than anything else," he said. "I will not put a price on our national security."