Updated

The border wall President Donald Trump has imagined could seal some Americans on the "Mexican side" — technically on U.S. soil, but outside of a barrier built north of the river separating the two countries.

Landowners could lose property. Those who that already lost some for an existing fence are already preparing for a new battle. Even if they don't win, lawyers hope to tie up the wall in court long enough that politics could stop it, either in Congress or after another election.

The Texas Civil Rights Project has begun signing up landowners and identifying people who might be affected.

The U.S. Border Patrol makes more apprehensions along the more than 300 miles (483 kilometers) of border in the Rio Grande Valley than anywhere else.