Making a brief statement to reporters, he said resignation does not imply "wrongdoing".
"I have yesterday tendered my resignation to the honourable Prime Minister while thanking him for giving me the opportunity to be a part of his team.
"I have done so to put an end to an unnecessary controversy in a matter which is before the honourable Supreme Court and in which no adverse comments have been made against me in any manner whatsoever. My conscience remains clear and I believe that I will stand vindicated because divine justice ordains that truth and justice will prevail," Kumar said in a statement.
He also said there are certain political decisions that are considered necessary and he did what the Prime Minister and the party high command thought was appropriate.
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Asked whether he has been made a scapegoat, Kumar refused to make a comment but said he would rather let people make a judgement.
"People of this country, my friends who stood by me, many of you in media and my esteemed colleagues in the profession know me for what I am. I would rather let them make a judgement," he said.