Sharif was disqualified by the Supreme Court on July 28 for not disclosing the salary he did not receive from his son's company.
"The decision to disqualify me had already been taken, only a justification was being sought," he told reporters.
He said there was big debate in the country over his disqualification as people were not satisfied with the reason cited by the court to send him home.
Sharif also challenged the court over the trial of former military dictator Pervez Musharraf and asked if there were any judges in the country who could hold Musharraf accountable.
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"Is there any court which can hold former dictators responsible for crimes like breaking up the country," he asked.
Sharif said he had not misappropriated even a single penny and it was wrong to say that he was trying to dodge accountability.
He said he appeared before the probe panel set up by the Supreme Court despite suggestion he was not bound to face the interrogation.
He rejected the impression and said it was a "journey back home and not a protest.