The conservative party Nippon Ishin no Kai submitted a bill to the Upper House on Tuesday that would ban people with dual citizenship from serving in the Diet.
The move is the latest in the backlash against newly elected Democratic Party President Renho, who despite her initial denial was found to have both Taiwanese and Japanese nationalities while campaigning in the party's leadership election earlier this month.
On Friday, Renho announced she had succeeded in relinquishing her Taiwanese citizenship.
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