"It is very unfortunate that P A Sangma is not observing decency, decorum and dignity in the Presidential elections," NCP General Secretary D P Tripathi told reporters here.
He said the Returning Officer, the Election Commission and the Supreme Court have rejected different pleas of the Sangma camp.
"We appeal to the BJP, AIADMK, BJD leadership to withdraw their support to Sangma for persistent violation of democratic norms," Tripathi said.
He said the NCP concurred with the views of Jammu and Kashmir Chief Minister Omar Abdullah that Sangma should observe decorum in the Presidential elections.
"This is the election to the highest Constitutional office and candidates must conduct themselves with democratic values," he said.
The NCP attack comes in response to Sangma's reported remarks in Mumbai that Rashtrapati Bhawan was being used as a dumping ground for 'failed' former Finance Minister Pranab Mukherjee.
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To a question, Tripathi said it was highly unlikely that the NCP would readmit Sangma into the party.
"The NCP had taken him back in the party fold when Sangma expressed his desire to return after a brief stint (with Trinamool). But I don't think the NCP will take him back now," he said.