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The 2009 Perak constitutional crisis was a political dispute in Malaysia regarding the legitimacy of the Perak state government formed in February 2009 .. Malaysia. Malaysia. Perak. Perak. It began when three Pakatan Rakyat state legislators defected , causing a collapse of the state government .. Pakatan Rakyat. Pakatan Rakyat. The Sultan of Perak then refused Menteri Besar Mohammad Nizar Jamaluddin 's request to dissolve the state assembly and call for new elections .. Perak. Perak. Sultan of Perak. Azlan Shah of Perak. Menteri Besar. Chief Ministers in Malaysia. Mohammad Nizar Jamaluddin. Mohammad Nizar Jamaluddin. state assembly. Perak State Legislative Assembly. Instead , Barisan Nasional -LRB- BN -RRB- , with support from the three defecting assemblymen , formed the new state government .. Barisan Nasional. Barisan Nasional. The BN state government 's legitimacy and the Sultan 's decision not to dissolve the state assembly was disputed vehemently by Pakatan Rakyat politicians .. Pakatan Rakyat. Pakatan Rakyat. state assembly. Perak State Legislative Assembly. A series of battles in the courts ensued between Nizar and the new Menteri Besar -LRB- Chief Minister -RRB- , Zambry Abdul Kadir .. Menteri Besar. Chief Ministers in Malaysia. Zambry Abdul Kadir. Zambry Abdul Kadir. Ultimately , the Federal Court confirmed in February 2010 that Zambry was the lawful menteri besar .. Federal Court. Federal Court of Malaysia