The Dallas Police Department bomb squad responded and took Wilkinson into custody without incident.
Immigration advocates reacted sharply, calling the policy a calculated attempt to discourage legal immigrants from applying.
Grassley, who previously chaired the Senate Judiciary Committee, defended the rule and rebuked Trump’s tone.
The summit reinforced their shared belief that ties with Pyongyang could be salvaged through renewed direct engagement.
The administration’s action against Cook, however, has drawn attention to Trump’s willingness to challenge institutional norms.
The Justice Department could appeal Cullen’s dismissal to a higher court, though legal experts say its chances are slim.