Sudhakaran refuted the allegation dubbing it as "absurd", but the CPI(M) leaders immediately seized on the issue and demanded an investigation based on the "revelation" of the Congress MP's former driver Prasanth Babu.
Babu, a former block president of Congress, who fell out with Sudhakaran some time back, today told television channels that he was present at Sudhakaran's house while they "plotted" on mounting an attack on the CPI(M) leader.
Reacting to the allegation, Sudhakaran said Babu was instigated by CPI(M) leaders who were in search of issues when the party was on the backfoot over Chandrasekharan murder case.
"There is a CPI(M) conspiracy behind this allegation. Babu had worked as my driver only for a month as a temporary arrangement. This allegation has been levelled against on past occasions also. Now the CPI(M) is trying to revive it as the party is in crisis."
Jayarajan, CPI(M) central committee member and sitting MLA from Mattannur in Kannur district, wanted the police to accord personal security to Babu as there could be attempt on his life in view of his "shocking revelation."
Talking to reporters in Thiruvananthapuram, CPI(M) state secretary Pinarayi Vijayan asked the police to register a case against Sudhakaran and order an investigation based on Babu's charge.
Since Sudhakaran is a Member of Parliament, the central leadership of the Congress should also make its stand clear on the allegation, Vijayan said.