Taiwan's interior ministry is forcing four political parties, including the main opposition KMT, to replace elected officials who cannot prove they gave up Chinese nationality ten years ago — a blow to the parties and to China-born politicians in Taiwan.

• Five people across four parties break the rule and must be replaced within three months.
• The parties are the KMT, the Economic Party, the Chinese National Chih-Kung Party, and the Xinhua Labor Party.
• The clock on the ten-year residency requirement now starts only when someone hands in proof they dropped their Chinese household registration — not when they first settled in Taiwan.
• The tighter reading came after a fight over a China-born former lawmaker's residency papers.
• Parties that miss the deadline will have those officials struck from the official record.

Outlook: The parties have three months to hold new internal elections, and the KMT is likely to push back on a rule that squeezes China-born members out of party posts.