"I will reveal the secret at an appropriate time. This is not the proper time to say anything," he said.
Preferring to remain silent on the issue, Gadkari, while sticking to his allegations, claimed the identity of the industrialist who had brokered the deal was already known to people in Delhi.
The former BJP chief had courted controversy when at a recent function in Delhi he charged a leading industrialist had brokered a deal between the two parties to stop BJP from coming to power in Delhi.
Describing Gadkari's statement as "irresponsible" and a "complete lie", Congress general secretary in-charge of Delhi Shakeel Ahmed has said the BJP leader should first produce evidence before levelling such unfounded allegations.
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He said BJP was frustrated because its hopes of coming to power in the state were shattered.
"Gadkari and his party are experts in carrying out such deals and not Congress," Ahmed said.
"Before making allegations of any deal against others, he (Gadkari) should first explain what was the deal due to which he was removed as BJP's President," Ahmed said.
"Even if it does not have any evidence, at least the name should be revealed. He (Gadkari) should tell us in which hotel was the deal brokered, the details of the people involved, the politicians involved," Sisodia said.