"If you go by the elimination process, the suspicion leads you there (to the BJP)," he told 'The Week', according to a release issued by the news magazine.
"Vellapally Natesan (SNDP leader) called me up and told me that it was difficult for him to let me attend the function as he was under tremendous pressure. I am absolutely certain that Natesan is not behind this," Chandy said.
"Although I am extremely sad, the grief isn't personal. To keep the CM out of such a function is an insult to the state," the chief minister said.
"So, quite clear that I was not withdrawing on my own.
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Then I got a call from an officer of special duty in the PMO saying that Natesan told them I would not be attending and asked for my confirmation.
The chief minister said the Congress in Kerala was quite sentimental about Shankar as the party never had a CM of its own after him as those who came after him were leading Congress-led alliances.
So when he was asked to stay away from the event after being invited to preside over it first, it hurt him deeply, Chandy said.
He received Modi when he arrived in Kochi and the entire Cabinet was present to see him off at Thiruvananthapuram airport.
Chandy said he had handed over a letter to Modi about about his views on the controversy while seeing him off at the airport.
He said although there was a possibility of an alliance between BJP and BDJS, the people of Kerala would not let the alliance flourish and that the statue unveiling controversy pointed to that.