AP Explains: How do immigration authorities make arrests?

After postponing an immigration-enforcement operation late last month, the Trump administration plans to go ahead with the raids as soon as this weekend. The sweep is expected to be similar to others that authorities have done regularly since 2003 and often netted hundreds of arrests. This one is different because President Donald Trump tweeted in June that it would be the start of an effort to deport millions of people who are in the country illegally.

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