Senior Congress leader Jairam Ramesh has said, the party is facing a serious existential crisis. <br/><br/>Talking to PTI in Kochi today, Mr Ramesh said, a collective effort by Congress leaders is required to overcome the challenges it faced from Prime Minister Narendra Modi and BJP Chief Amit Shah. <br/><br/>He said, it was wrong for the Congress to think that anti-incumbency will work automatically against the NDA government in states being ruled by the BJP in the elections.