Kathmandu, Aug 30 - Nepal's three-month-old government was plunged into a constitutional crisis Sunday with embattled Vice President Paramananda Jha rejecting a double deadline set for him by the government and Supreme Court to take his oath of office again in Nepali.

The post of the republic's first vice-president is now in danger of becoming 'inactive' after midnight and a new legal battle will begin, stoking fresh animosity between the country's elite hill community and the Terai plains in the south.

Jha, who has been in the eye of a storm since last year when he took his oath of office and secrecy in Hindi instead of Nepali, called a press conference in his office Sunday after the council of ministers asked him to take the oath again in Nepali in a new ceremony at 4 p.m.

'I will consider the issue only after the government passes a constitutional amendment and shows respect for all the languages spoken in Nepal,' the 65-year-old said.

'When an oath is taken, language is not the concern but commitment to the welfare of the nation and people. Nationalism is reflected by one's thoughts, not language.'

Jha flayed the Supreme Court, which this month had asked him to take the oath in Nepali by Sunday or face dismissal, calling it a blow to democracy as well as the court's own dignity.

'Language, race, religion and culture are deeply sensitive issues,' he said. 'All languages, religions and races have to be complementary.'

Jha indicated he was going on indefinite leave while his team of lawyers would from Tuesday begin battling the Supreme Court decision.

The move leaves the government in a bind with the parties supporting Jha calling a shutdown in the Terai and stepping up protests in the capital.