Josipovic said in an interview with Croatian Radio on Monday that all citizens, particularly office-holders, were obliged to account for their actions before the parliament.
Describing Sanader's failure to appear before the commission as an act of ignoring the parliament, the president said he hoped that Sanader would eventually come.
Josipovic said that it was now crucial to establish under which circumstances INA's shares had been sold and why the Croatian state, which holds a certain interest in INA, did not have a corresponding share in management rights over that oil and gas group.
The president reiterated his dissatisfaction with the situation in the economy and with the non-implementation of the planned reforms.
In this context, he suggested that the government should change its tax policy to relieve the tax burden on labour and levy taxes on real estate, dividends and capital gains instead.
As regards media reports on the import of meat of poor quality, Josipovic pushed for a detailed investigation.
"If there have been omissions, it should be established who is responsible. If the reports are incorrect, the situation should be defused," the president said.
Asked about his opinion on demands that a referendum be called on the government-sponsored amendments to labour legislation although they have been withdrawn, the president said that "it is a question now whether we should spend HRK 170 million for other purposes, economic or social ones, or hold the referendum, for which it is already clear that its outcome will be positive."
Asked what he expected to happen with the Hina news agency, in which a procedure for the appointment of a new director is under way this week and which has been making losses, Josipovic said that Hina was a state-owned news agency and therefore the government should solve that problem.
Josipovic drew parallels between Hina and the national broadcaster HRT.
In both cases we have a similar situation -- a difficult financial situation and discontented employees, he said, describing Hina and HRT as important companies of national significance.
It is necessary to find a balance between their operating as public institutions and ensuring strict control of financial discipline and working conditions, he said, warning against applying the models used to settle the situation in the Vjesnik daily and the Official Gazette, which he said had proved to be extremely bad.
Josipovic gave the interview during a visit to the coastal town of Crikvenica.