That the decision to arrest him was "wholly arbitrary" was clear from the way the case had progressed, the former Law Minister said.
"Karti Chidambaran's arrest mocks the constitutional conscience as far as the citizen's fundamental right to personal liberty and dignity is concerned," he said.
Referring to the fact that he had been taken into custody, Kumar said, "We cannot also forget that in criminal cases bail is the rule and jail is an exception as declared by the SC several years ago and reiterated recently".
"It is self-evident that fundamental constitutional guarantees cannot be suborned brazenly for political considerations through subversion of the first principles of law," he said in a statement.
The former Law Minister said Karti Chidambaram had been interrogated for several hours at different times during the last few months and all documents considered necessary were with the prosecuting agency.
He said it has also been established by Karti's conduct in strictly complying with the court's directions to join investigations that he has no intention of evading trial or fleeing from justice.
"Such actions enable fugitives from the law to question the legitimacy and fairness of our investigative processes and bring into question our commitment to the rule of law and human rights," he alleged.
Congress communications in-charge Randeep Surjewala also said P Chidambaram and his family were being harassed, but the Congress believed in justice and had faith in the judiciary.
Surjewala said he hoped the judiciary would "put its stamp" on Karti's innocence in the case.
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