Donald Trump has pledged to begin deporting millions of undocumented immigrants as soon as he takes office next year.

For now, Los Angeles police chief Charlie Beck has no plans to help him do it.

“We’re going to maintain the same posture we always have,” Beck told a Los Angeles radio station on Monday. “We don’t make detentions or arrests based solely on status, whether that’s immigration status or any other status.

“If the federal government takes a more aggressive role on deportation, then they’ll have to do that on their own.”

Beck called any effort to arrest and deport people a “monumental task” and estimated that there are 500,000 undocumented residents in the city of Los Angeles alone.

“This is a population we police by creating partnerships, not by targeting them because of their immigration status,” he added.

Since the earliest days of his presidential campaign, Mr Trump has made immigration enforcement a central pillar of his message to voters. He has promised to build a wall along the US-Mexico border, labelled undocumented immigrants “rapists” and pledged to aggressively deport millions of people.

In an interview that aired on Sunday, the President-elect told CBS News that he would deport two to three million undocumented immigrants who “have criminal records”.

“What we are going to do is get the people that are criminal and have criminal records, gang members, drug dealers, we have a lot of these people, probably two million, it could be even three million, we are getting them out of our country or we are going to incarcerate,” he said.

When pressed by the broadcaster about his campaign pledge to deport “millions and millions of undocumented immigrants”, Mr Trump said that after securing the border, his administration would make a “determination” on the remaining undocumented immigrants in the country.

“After the border is secure and after everything gets normalised, we’re going to make a determination on the people that they’re talking about – who are terrific people. They’re terrific people, but we are going to make a determination at that,” Mr Trump said. “But before we make that determination … it’s very important, we are going to secure our border.”

According to The Washington Post Fact Checker, Mr Trump likely gets these estimates from a US Department of Homeland Security (DHS) fiscal 2013 report saying there were 1.9 million “removable criminal aliens”. However, that figure includes undocumented immigrants and people who are lawful permanent residents, and those who have temporary visas.

As for how many of those people are illegally present noncitizens, there are conflicting figures from the think tank Migration Policy Institute and the Centre for Immigration Studies. In a fact check, The Washington Post rated Mr Trump’s figures “Two Pinocchios,” noting that federal immigration enforcement data is “not always transparent or reliable”.

Already, under President Obama’s orders, an increasing percentage of those deported were people with criminal records, according to the DHS. In fiscal 2015, 91 percent of “removals and returns” were people previously convicted of a crime, compared to 86 percent in fiscal 2014 and 67 percent in fiscal 2011.

If there was one location in the United States in which Mr Trump could make the largest dent in the country’s undocumented population, it would be sprawling Los Angeles County, where citizens and noncitizens have lived side-by-side for decades.

Almost a quarter of the nation’s 11 million undocumented immigrants live in California, according to the Public Policy Institute of California. With an undocumented population of nearly 815,000, according to PPIC, Los Angeles County has more undocumented residents than any county in the state.

Though estimates vary, experts calculate that more than 1.6 million illegal immigrants live in Texas, making it second only to California in the size of its undocumented population.

The LAPD has spent decades avoiding a significant role in the enforcement of federal immigration policies, even as the city’s undocumented immigrant population swelled.

Following a special order by then-chief Daryl Gates in 1979 that stopped officers from inquiring about someone’s immigration status, the Los Angeles Times reported, the LAPD has for decades managed to remain outside the contentious immigration debate.

In a subsequent interview with the Los Angeles Times, Mr Beck reiterated that working with the Department of Homeland Security on deportation was not the department’s job.

“I don’t intend on doing anything different,” he said. “We are not going to engage in law enforcement activities solely based on somebody’s immigration status. We are not going to work in conjunction with Homeland Security on deportation efforts. That is not our job, nor will I make it our job.”

Unveiled in 1979, Special Order 40 directed LAPD officers to “not initiate police action” in an effort to ascertain someone’s legal status. Officers were instructed to notify the US Immigration and Naturalisation Service after arresting someone “for multiple misdemeanour offences, a high grade misdemeanour or a felony offense” or someone who “has been previously arrested for a similar offense”.

“The Los Angeles community has become significantly more diverse during the past several years with substantial numbers of people from different ethnic and sociological backgrounds migrating to this city,” the order states. “Many aliens, whether from Latin American, African, Asian or European countries, are legal residents. Others are undocumented and are residing in the city without legal sanction.”

Since Mr Beck became police chief in November 2009, the Los Angeles Times reported, the department has gone even further to remove itself from playing a role in deportations. Officers no longer hand people “arrested for low-level crimes to federal agents for deportation and [have] moved away from honouring federal requests to detain inmates who might be deportable past their jail terms,” the paper reported.

Mr Beck told the paper that his command staff has met with community leaders and has delivered a consistent message when asked about immigration enforcement:

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“This is the same LAPD you had Monday, a week ago,” he said. “We have not changed because of the election on Tuesday. We have the same principles. We have the same values,” he said. “This is not going to change the way that the Los Angeles Police Department enforces the law.”

The Los Angeles Times reported that the city’s Mayor Eric Garcetti also reiterated that police would continue to enforce Special Order 40.

“Our law enforcement officers and LAPD don’t go around asking people for their papers, nor should they,” he said. “That’s not the role of local law enforcement.”

Though Mr Trump has threatened to withhold federal tax dollars, mayors of US cities across the country have promised to protect their residents from deportation.

New York Mayor Bill de Blasio even left open the possibility of deleting a database with the names of hundreds of thousands of undocumented immigrants living in New York. He was joined in opposition by Chicago’s Rahm Emanuel and Seattle’s Ed Murray, both of whom have pledged to resist efforts to deport their residents.

“Seattle has always been a welcoming city,” Mr Murray said on Monday, according to ABC News. “The last thing I want is for us to start turning on our neighbours.”