Self-exiled former Pakistani prime minister Benazir Bhutto is due to announce a date for her return to Pakistan today.
There have been no breakthrough in sight in talks on a power-sharing deal with President Pervez Musharraf, however.
Gen Musharraf and Ms Bhutto have been trying for months to secure a pact that would help him get re-elected for a second five-year term and allow her to return without fear of prosecution on outstanding corruption cases.
Former prime minister of Pakistan Benazir Bhutto speaks at a conference in London last July
But with a presidential election due within the next four weeks, there are no signs that they have reached an accord.
"We are going to announce the date of Mohtarma Benazir Bhutto irrespective of whether there is any agreement or not," Ms Bhutto's spokesman said. "Time is fast running out, and we don't have any more scheduled talks."
Earlier this week, authorities deported another former prime minister, Nawaz Sharif, to Saudi Arabia hours after he landed at Islamabad airport after a seven-year exile.
Mr Sharif is the man General Musharraf ousted eight years ago, whereas Ms Bhutto is seen as a potential ally.
An aide to Ms Bhutto said this month she planned to return to the country in October, which would enable her to lead her Pakistan People's Party campaign for parliamentary and provincial assembly elections due around the end of the year.
Gen Musharraf has seen his authority eroded and popularity dwindle since his unsuccessful attempt to fire the country's chief justice in March.