Chang is expected to reshuffle the Cabinet later this week in a bid to improve government efficiency and give candidate Frank Hsieh a leg up in what is expected to be a tightly contested presidential race against Ma Ying-jeou of the main opposition Nationalists.


The premier is the second most powerful man in Taiwan, after the president, and is in charge of setting policies and running the day-to-day administration of the government.


He also heads the cabinet, with all the ministers reporting to him.


Su stunned the nation with his resignation on Saturday, less than a  week after he lost the ruling party's primary for the 2008  presidential election.