The US government is introducing a new fast-track deportation process that will bypass immigration courts, APA reports citing ABC News.
Under the new rules, any undocumented migrants who can't prove they've been in the US continuously for more than two years can be immediately deported.
The policy is expected to be published on Tuesday, and then implemented across the country with immediate effect.
However the American Civil Liberties Union (ACLU) rights group has said it plans to challenge the policy in court.
It comes as US immigration policy comes under increasing scrutiny - in particular, the conditions at the country's detention centres on the southern border with Mexico.
Kevin McAleenan, acting secretary of Homeland Security, said the change would "help to alleviate some of the burden and capacity issues" at the border.
He added that it was "a necessary response to the ongoing immigration crisis".
Analysts say US President Donald Trump is planning to make hardline immigration control a key element of his re-election campaign in 2020.
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