Pakistan’s prime minister said Wednesday he is moving toward dissolving parliament, starting a possible countdown to a general election, as his chief political rival fought to overturn a corruption conviction that landed him in a high-security prison over the weekend.

Prime Minister Shehbaz Sharif told lawmakers that he would seek approval from Pakistan’s president to disband the national assembly as its five-year term ends. With such an approval, a formality, a general election would typically have to be held within 90 days.

This year there’s a twist, though. A delay until the spring is possible if Pakistan’s election commission opts for redistricting ahead of an election, based on the results of a recent census.

The uncertainty over the election date coincides with the legal and political drama surrounding Sharif’s predecessor, Imran Khan. The 70-year-old popular opposition leader was convicted by an Islamabad court over the weekend of concealing assets and was immediately sentenced to three years in prison.

Khan has appealed the conviction which effectively removes him from the election campaign, at a time when his party seemed to be doing well in the polls.

The Islamabad High Court, where his appeal is being heard, said Wednesday that it wants to hear from the government and Pakistan’s election commission before making a decision on whether to overturn the conviction and order Khan’s release.

The commission last year disqualified Khan from holding public office for five years, accusing him of unlawfully selling state gifts and concealing assets as premier. Khan was notified of his disqualification again on Tuesday following his sentencing.

The court adjourned Wednesday without setting a date for the next hearing, dealing a blow to Khan’s legal team which has argued he is being held in unacceptably tough conditions at Attock prison, about an hour’s drive from Islamabad. The court’s eventual ruling could be appealed and heard by Pakistan’s Supreme Court.