The Congress on Saturday said peace in violence-hit Manipur is not possible under Chief Minister N Biren Singh and demanded that the prime minister replaces him immediately. Presenting an eight-point charter of demands on behalf of the Congress at an all-party meeting convened by Home Minister Amit Shah in Parliament building, former chief minister of Manipur Okram Ibobi Singh said it was unfortunate that he was not allowed more time to put across his views towards the end of the meeting.