In the long contest between economic integration and national sovereignty, the Trump administration has drawn a new line — this time at the gates of one of America's oldest industrial icons. Transportation Secretary Sean Duffy publicly warned Ford Motor Company that its technology partnerships and commercial ties with Chinese firms represent an unacceptable risk to national security, elevating what many corporations have treated as routine global business into a matter of federal concern. The rebuke signals not only a hardening posture toward China, but a willingness to use the weight of publi