• Trump officials claim triumphal arch is needed for national security.
• Defense Secretary Pete Hegseth and Homeland Security Secretary Markwayne Mullin submitted sworn statements.
• The arch's proposed height is said to create a 'significant elevation advantage'.
• Construction could begin as early as November 5.

This new justification may indicate a shift in the Trump administration's strategy to justify the project, which could have implications for national security policy and the use of executive power. The invocation of national security may suggest an attempt to circumvent traditional approval processes, which could set a precedent for future projects.