The Tohono O'odham Nation (a federally recognised Indigenous tribe of around 37,000 members whose territory straddles the US state of Arizona and Mexico's Sonora state) has filed a lawsuit against the Trump administration after armed federal agents accompanied construction workers onto its land before dawn to begin building a controversial border wall. The tribe says roughly 20 masked Customs and Border Protection agents deployed a SWAT team and vehicle blockade to prevent tribal police from issuing trespassing citations, following a federal judge's August 14 refusal to halt construction. The Nation argues the wall violates its sovereignty, threatens sacred sites and burial grounds, and is unnecessary given that it has already reduced cross-border detentions by over 95 percent through its own security measures.