tbilisi georgian president giorgi margvelashvili friday reluctantly sign law new constitution away direct election president switch system proportional representation parliament margvelashvili unsuccessfully try veto draft bill say personally difficult sign document interest stability country straddle energy supply route europe arena strategic rivalry russia west consider country internal external challenge fact everything avoid possible cause detribalization sign document margvelashvili say statement margvelashvili originally send draft back parliament objections include oppose call end direct elections president parliament overturn veto margvelashvili elect 2013 five-year term criticize rule georgian dream party adopt constitution without consensus political force ex-soviet country obvious since first day constitutional reform process rule party aim adopt one-party constitution say next presidential election georgia hold 2018 clear whether margvelashvili odds rule party several issue stand mps georgian dream say constitutional reform process set new constitutional tradition culture georgia amendments introduce strengthen rule party political position ... strengthen democracy georgia irakli kobakhidze parliamentary speaker say new constitution enter force follow next presidential election next year georgian president reluctantly sign new constitution law