Kathmandu : Nepalese President Ram Baran Yadav Monday urged the Constituent Assembly to elect the country’s prime minister according to the statute. Yadav had given a week’s time – which expired Sunday – to the parties for forming a government of national unity. “As the parties failed to form a national unity government through a political consensus, the president has sent a letter to the Constituent Assembly to elect a new prime minister of the country,” a press statement issued by the president’s office. It said since the Constituent Assembly has been elected, forming a government is a matter of urgency. The Nepali Congress has selected its president Sushil Koirala as its prime ministerial candidate.