# US border wall construction and enforcement > Live situation record from CLSTR: https://clstr.news/situations/us-border-wall-construction-and-enforcement > Updated: 2026-10-17T22:05:27.000Z. Sources: 4. Developments: 2. Acting Homeland Security Secretary Markwayne Mullin recently toured the Arizona border to inspect new primary, secondary, and waterborne barrier construction. Customs and Border Protection (CBP) reports indicate that Fiscal Year 2026 saw the lowest number of border crossings in American history, with 250 miles of new barriers and supporting technology completed since January 20, 2025. Mullin stated that no migrants apprehended during illegal entry attempts have been released during the first 17 months of the current administration, noting that 2,268 known terrorists have been identified as having entered illegally during this term. However, Mullin attributed delays in the overall completion of the border wall—which is not expected to be finished until late 2027 at the earliest—to opposition from California Democrats and various left-wing interest groups. He cited legal efforts by California officials and funding refusals in Congress as factors that necessitated the use of emergency funds by the administration. ## Timeline ### 2026-10-17: Homeland Security Secretary blames California Democrats for border wall delays Homeland Security Secretary Markwayne Mullin cited opposition from California Democrats and legal challenges as primary reasons for delays in completing the U.S. border wall. 2 sources. https://clstr.news/cluster/homeland-security-secretary-blames-california-democrats-for-border-wall-delays ### 2026-10-16: DHS Secretary Mullin tours Arizona border wall construction Acting DHS Secretary Markwayne Mullin toured the Arizona border, highlighting 17 months of zero migrant releases and the completion of 250 miles of new border barriers since January 2025. 2 sources. https://clstr.news/cluster/dhs-secretary-mullin-tours-arizona-border-wall-construction --- Cite as: US border wall construction and enforcement. CLSTR, https://clstr.news/situations/us-border-wall-construction-and-enforcement