The main opposition Fidesz party's recently established fact-finding committee will first look into the development of Hungary's budget deficit and the government's decisions concerning the sale of carbon dioxide quotas, Mihaly Varga, former finance minister and head of the committee, told reporters on Thursday.

At the press conference, Varga called on the government to "stop secretly selling out" the country's carbon dioxide quota and stop "giving away similar assets" before the general elections in April.

Varga said that the committee was to complete its report by August.

Fidesz leader Viktor Orban announced setting up the committee on Monday. He then said that the new body was designed to "perform a full screening" of the economy.

Government spokesman Domokos Szollar said that all Hungarian economic and budget data was open and available to all. He said that the government would ensure that all democratic parties in Hungary would have a renewed opportunity to scrutinise the books.

"There aren't any secrets, no cats in the bag or skeletons in the closet," Szollar said.