Trump Proposes NATO Article 5 for US Southern Border, Sparks Alliance Debate

• Donald Trump suggested invoking NATO's Article 5 to address illegal immigration at the US southern border.
• This proposal would extend Article 5's collective defense clause beyond its traditional military scope, a significant departure from precedent.
• Trump questioned NATO's reliability, stating uncertainty if allies would defend the US despite American support.
• Article 5, invoked only once after 9/11, commits allies to assist a member under armed attack, not for domestic law enforcement or migration control.
• The suggestion revives tensions with European allies over burden-sharing and alliance commitments, coinciding with Trump's focus on Greenland.

Why It Matters: Trump's controversial proposal to use NATO's Article 5 for border security challenges the alliance's core purpose.