President Donald Trump has quickly mobilized wide swaths of the federal government to arrest and detain undocumented immigrants in the United States, part of a broader strategy to amass a large enforcement machine.

Local law enforcement agencies play a limited role in immigration law, but that might change during Trump's promised mass deportation operation.

Specifics of detainments have been scarce, leaving it unclear whether the criminals being targeted make up a significant share of those being captured.

Some of the 8,000 migrants arrested under the Trump administration's deportation crackdown have already been released back into the U.S., according to a report. Agents from Immigration and Customs Enforcement have conducted raids in cities such as New York,

Some people caught in Trump administration immigration operations have already been released back into the United States on a monitoring program.

A massive crowd of protesters blocked traffic on a downtown Los Angeles freeway, causing major delays, in response to President Donald Trump's illegal immigration crackdown.

As the Trump administration moves forward with its immigration agenda, immigration advocates across the country are mobilizing to protest.