Dutch activists set up illegal vehicle checks at German border to halt asylum seekers. Interior Ministry demands respect for rule of law and lets police handle it. Minister admits migration frustration is understandable but forbids self-help. Government pushes stricter asylum laws and better border controls. Geert Wilders praises action as fantastic and demands army takeover. Wilders pulls party from coalition over failure to harden asylum policy. About 12 men conducted Saturday night checks on road to migrant center Ter Apel. Police and local authorities ban citizen stops as dangerous and illegal. CDU politician Bilger says German federal police handles borders so no vigilantes needed. Social media calls for repeat actions Sunday night. Coalition government collapsed Tuesday over asylum disputes.