"This is an obstructionist transition," said Mark Morgan, former acting Customs and Border Protection Commissioner

The Biden administration is "quietly rushing to implement new policies that will loosen restrictions on migrants who entered the US illegally," according to The New York Post.

The measures are a clear attempt to "thwart President-elect Donald Trump's immigration crackdowns and mass deportations," sources told the Post.

New York City is at the center of these efforts. Officials are aiming to launch an ICE portal app that will allow migrants to bypass in-person check-ins with their local ICE office.

According to the officials who spoke to the Post, this change will make it easier for migrants to flee authorities. The app also doesn't check for past arrests or outstanding warrants, something ICE agents do during in-person checks.

As many as 100,000 migrants will be enrolled in the new program's initial wave.

Other initiatives being pushed through before Trump is inaugurated on 20 January include allowing migrants to contest orders forcing them to be electronically tracked while awaiting immigration appointments.

Reversing the policies is likely to prove difficult and be subject to legal challenge.

"This is an obstructionist transition," said Mark Morgan, former acting Customs and Border Protection Commissioner.

"What they're trying to do in the last final day, they're going to try to put up as many roadblocks and obstacles and throw as many grenades as they can on their way out."