Officials said that the 2002 order to the Delhi government cannot be rescinded without legal consultations and the Home Ministry may refer the matter to the Law Ministry for its opinion.
Since this order was not passed by the present government, the legal antecedents of the order have to be, therefore, verified before taking any decision on it, the officials said.
However, a final decision on the matter will be taken by Home Minister Sushilkumar Shinde after his return to Delhi from Maharashtra.
In his letter to Shinde, Kejriwal said the order should be withdrawn as it was against the Constitution.
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"That was only an order....Which is completely against the Constitution. How can an order by the Home Ministry curtail the law-making powers of the Delhi Assembly? It is a very serious issue....
"I have taken oath of the Constitution and not the Home Ministry's order. I will uphold the Constitution," Kejriwal told PTI yesterday.
The Delhi Cabinet, after approving the bill, also passed a resolution that the central government order was unconstitutional.
Kejriwal said that he can "go to any extent" to get the anti-corruption bill passed.
Asked if he would resign, the Aam Aadmi Party leader responded by affirming that he could go to any extent over the "huge" issue of corruption. "That (resignation) you interpret," he added.