Ruing that she was not given a hearing by the top leadership after a flurry of media reports carrying "insinuation and innuendo" against her, the Congress leader downplayed the "Jayanthi Tax" barb from BJP's then Prime Ministerial candidate Narendra Modi saying that when her own party treated her so badly, how can she blame someone who was in Opposition.
"If my own party treats me so badly. Why should I blame him? He was in opposition. If Modi is talking of Jayanthi tax, let them investigate.
"Let the CBI investigate. I welcome it. I look forward to it because it will give me an opportunity to explain my position," Natarajan said.
The Tamil Nadu leader made it clear that she has no problems with the state Congress unit.
"My issues are with the national high command. I was totally sidelined by the national high command," she said recounting that her repeated attempts to seek an audience with Sonia Gandhi and Rahul Gandhi were unsuccessful and added that "even a murderer" gets a chance from the court to explain his position.
Claiming that the main hardline view on the environmental issues was given by Rahul Gandhi that led her to hold back permission to a number of big investment projects, she said that she was "following only the party line".
She said that she stuck to the stand despite heated discussions in the Union Cabinet over the stand as many of her ministerial colleagues felt that those decision were blocking investment and thereby development.
"I had to face the anger and wrath of my colleagues, who felt that investment is being blocked...I fully followed the party line," she said, recalling that the Congress President also insisted on the need to protect forest rights.
Natarajan, who was a fourth generation Congress leader from her family, said that it was "extremely painful and very heartrending day" for her when things have to come to a position where she has to disassociate herself from the Congress party.
"I come from a family, which has Congress blood flowing in our veins....Congress blood runs in my vein," she said recalling her association with the party from Youth Congress days and making no bones about her being an "utter loyalist" of the Gandhi family.
She, however, significantly added "Congress is no longer the same Congress that I had joined".
Her remarks have come at a time when questions have been raised in the party over Rahul Gandhi's style of functioning ever since the worst-ever poll debacle of Congress in Lok Sabha elections.
Recalling the chain of events that culminated into her resignation in 2013, she said that a "tense, grim" Prime Minister Manmohan Singh told her that Congress President wanted her to resign as she was required for party work.
She later spoke to Sonia Gandhi on phone where she was told that she has to follow the directions, Natarajan said.
Natarajan also said that the Prime Minister has even written a letter praising her work when she had resigned.
She, however, rued that later on there were stories planted in Delhi media from Rahul Gandhi's office that she was not to be drafted for party work and some time later was dropped as a party spokesperson.