By Julia Ainsley, Carol E Lee And Laura StricklerNBC News

Donald Trump’s transition team plans to end two administration programs championed by Joe Biden that allowed more than 1.3 million immigrants to legally enter the United States – and make them eligible for deportation those who have entered but have not yet been granted asylum.

Two sources close to the project cited by our partner network NBC News said the exact number of people who could be deported by the move is not known, but is estimated to be several hundred thousand.

Trump has promised to carry out mass deportations – with his team considering plans to maximize the scope of expulsions and prioritize certain immigrants among the first to be forced to leave.

Although those who entered under these programs may be deported, the first people likely to be targeted are those considered threats – possibly including Chinese men considered to be of military age and living illegally in the United States, both sources said, and said a third familiar with the plan.

This group would also include convicted felons who are in the United States illegally and those who have received a final order of deportation, officials said.

Migrants who arrived in the country legally under the Biden administration’s two programs — called “CBP One” and the “Cuba, Haiti, Nicaragua, Venezuela (CHNV) Parole Program” — may be safe from expulsion if they have already obtained asylum or if they are on the path to it.

Otherwise, they could be deported under Trump’s plan to dramatically increase the number of migrant expulsions.

The sources cautioned, however, that they may not be considered top priorities for deportation after Trump takes office, but could still be deported eventually.

These programs are a critical part of Biden’s strategy to increase the number of legal pathways for migrants to enter the United States while discouraging illegal border crossings.

Since the migrants entered the United States legally, any attempt by Trump to deport them will likely be challenged in court by various groups.

A Trump campaign spokesperson did not respond to a request for comment from NBC.