The JD(U) on Tuesday hit out at the Congress' attack on Bihar Chief Minister Nitish Kumar and wondered why the party seemed bent on shortening the life of their grand alliance along with the RJD in Bihar.Party spokesperson K C Tyagi took strong exception to Congress leader Ghulam Nabi Azad's comments on Nitish Kumar for his support to NDA presidential candidate Ram Nath Kovind.<br/>Mr Azad had said on Monday that those who have one principle take one decision and those who have many take different decisions which was a jibe aimed at Mr Kumar.Mr Tyagi said, JD(U) support to Mr Kovind is an isolated incident and there is no question of joining the BJP. <br/> On the other hand, BJP spokesperson G V L Narsimha Rao said the coalition in Bihar is riddled with internal contradictions and ruling alliance in the State appeared to be on the verge of collapse. He claimed that Prime Minister Narendra Modi and Chief Minister Nitish Kumar had a natural admiration for each other.<br/><br/>