At a time, when the West Bengal government and the State Election Commission have started making full-fledged preparation for the Gorkhaland Territorial Administration (GTA) election in the hills of Darjeeling in north Bengal by June this year, Gorkha Janmukti Morcha (GJM) supremo Bimal Gurung has written a letter to West Bengal Chief Minister, Mamata Banerjee, asking her to postpone the GTA polls till the time a permanent political situation in the hills is achieved.