US

Border wall could leave some Americans on 'Mexican side'

  • FILE - In this Thursday, Sept. 17, 2015, photo, Pamela Taylor, whose home is on the south side of the border fence, stands near a sign she erected, in Brownsville, Texas. The last time U.S. officials built a barrier along the border with Mexico, they left an opening at the small road leading south to Taylor's home on the banks of the Rio Grande. (AP Photo/Eric Gay, File)

    FILE - In this Thursday, Sept. 17, 2015, photo, Pamela Taylor, whose home is on the south side of the border fence, stands near a sign she erected, in Brownsville, Texas. The last time U.S. officials built a barrier along the border with Mexico, they left an opening at the small road leading south to Taylor's home on the banks of the Rio Grande. (AP Photo/Eric Gay, File)  (The Associated Press)

  • FILE - In this Thursday, Sept. 17, 2015, photo, Pamela Taylor, whose home is on the south side of the border fence, stands near the Rio Grande, in Brownsville, Texas. The last time U.S. officials built a barrier along the border with Mexico, they left an opening at the small road leading south to Taylor's home on the banks of the Rio Grande. (AP Photo/Eric Gay, File)

    FILE - In this Thursday, Sept. 17, 2015, photo, Pamela Taylor, whose home is on the south side of the border fence, stands near the Rio Grande, in Brownsville, Texas. The last time U.S. officials built a barrier along the border with Mexico, they left an opening at the small road leading south to Taylor's home on the banks of the Rio Grande. (AP Photo/Eric Gay, File)  (The Associated Press)

  • FILE - In this March 22, 2017, file photo, Antonio Reyes of Brownsville, Texas, stands by the U.S.-Mexico border fence near his home. Reyes said he's seen people scale the border fence that bisects his backyard and jump down in seconds. Sometimes they carry bales of what appear to be drugs. A higher wall is "still not going to stop them," he said. "They'll shotput it or whatever they have to do." (AP Photo/Rodrigo Abd, File)

    FILE - In this March 22, 2017, file photo, Antonio Reyes of Brownsville, Texas, stands by the U.S.-Mexico border fence near his home. Reyes said he's seen people scale the border fence that bisects his backyard and jump down in seconds. Sometimes they carry bales of what appear to be drugs. A higher wall is "still not going to stop them," he said. "They'll shotput it or whatever they have to do." (AP Photo/Rodrigo Abd, File)  (The Associated Press)

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.