The constitution was further amended in 2005, creating a two-vote electoral system, with single member plurality seats and proportional representative seats, and abolishing the National Assembly, transferring most of its former powers to the Legislative Yuan, and leaving further amendment voting to public referendums. The issue of formally declaring the independence of Taiwan is also a constant constitutional question. Arms purchases from the United States are still a controversial political question, with the Pan-Green Coalition camp favoring the purchase, and the Pan-Blue Coalition opposing it.