"It is a futile issue. Soli Sorabjee (former Attorney General) also spoke on it. I don't need to comment on it," he told reporters at an Iftar party hosted by Congress President Sonia Gandhi.
He was responding to a question on the controversy triggered by former Supreme Court judge and Chairman of Press Council of India Markandey Katju.
Katju had alleged that three ex-Chief Justices of India made "improper compromises" during UPA rule in retaining a judge in Tamil Nadu under corruption cloud.
The NDA Government had later stated in Parliament that the PMO during Manmohan Singh's tenure had asked why the Supreme Court collegium had not recommended extension for the Madras High Court judge who was facing corruption charges after the collegium expressed its hesitation.
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The Modi Government has also demanded that the former Prime Minister should make a "categorical" statement on the controversial matter.
Asked about the situation in Uttar Pradesh in the wake of the violent clashes between two communities in Saharanpur, Singh said, "the UP situation is worrisome".