He dubbed the decision of not calling Raja as a "serious omission."
Sinha, who is also a member of the JPC, said he would write to Prime Minister Manmohan Singh and Lok Sabha Speaker Meira Kumar that the intentions with which the panel was formed will not be fulfilled if Raja is not called as a witness.
"...I saw in my mail a letter from A Raja to Chacko which casts serious doubts about the JPC's intention and in that letter Raja says he has written three or four letters to Chacko and in his replies, the JPC Chairman just acknowledges his letters and said nothing about his coming before the panel as a witness," he said.
Raja had made a written submission before the JPC in March and his response was recently circulated to committee members.
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"I think it's a very serious omission that the Chairman of JPC is trying to make by not inviting Raja to depose before the JPC. Raja is right in casting aspersions on the intentions of JPC," he told reporters here.
"I think we are proceeding in a direction where JPC will be used to conceal the truth rather than expose the truth. And it is a very serious matter. Unfortunately, the Chairman of JPC, despite our requests, he is not calling a meeting of the panel so that (the) matter could be thrashed out in such a meeting," Sinha said.