Trump starting to sound like Obama on immigration

Two million or 3 million people could be immediate targets for deportation under this approach, Trump said, providing a likely inflated figure.

[...] that "big, beautiful wall" at the Mexican border?

Trump said in an interview with "60 Minutes" broadcast Sunday that immigration enforcement will concentrate on criminals.

Obama's Homeland Security Department has operated similarly.

Since 2010, criminals comprised more than half of those deported from the U.S. Over his presidency, Obama has overseen the deportation of more than 2.5 million people.

[...] some federal court rulings make it difficult for local jails to hold immigrants beyond their criminal sentences or strictly for immigration violations.

The other million or so people had some sort of legal status, including green cards or visas.

Deporting green card holders is possible, though the process can involve lengthy court proceedings.

Trump would also face myriad environmental regulations, objections from private land owners and a legally binding 1970 treaty with Mexico that governs structures along the Rio Grande and Colorado River at the Mexican border.