Tohono O’odham is a native american reservation that spans the US/Mexico border. Members live on both sides (mostly the US side).

They have long opposed a fortified wall on their land, though recently did compromise to allow some surveilence towers

Agreement reached to build border surveillance towers on Tohono O'odham land

After five years of negotiations, Border Patrol agreed to a privacy plan demanded by tribal officials.

news.azpm.org

Recently a gate was closed to vehicle traffic making it much more difficult for some villages on the Mexican side to get to groceries

A Closed Border Gate Has Cut Off Three Tohono O'odham Villages From Their Closest Food Supply

An effort to deliver food is only a temporary solution.

Pacific Standard

Here is a good overview of the reservation and issue

Trump’s border wall would trample on indigenous land and culture

Its construction could bring harm to sacred sites, archaeological resources, and sensitive ecosystems that the Tohono O'odham Nation relies on.

Grist