TOKYO - Japan's top government spokesman Yoshito Sengoku said Sunday the ruling Democratic Party of Japan (DPJ) might form a new coalition government, according to a Kyodo News report.

DPJ sources has revealed that Prime Minister Naoto Kan has called on the minor opposition Sunrise Party of Japan to join his coalition government and offered it a Cabinet post, as Kan is desperate for support outside the coalition to secure the smooth passage of bills through the divided Diet next year.

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DPJ president and Secretary General Katsuya Okada talked to the two leaders of the Sunrise Party, which has six parliamentarians, about joining the coalition government, according to media reports.

However, in an interview with media organizations Friday, Kan said he had not made any official offer to the party.

Local media also has said the Sunrise Party appears unwilling to join the two-party ruling coalition that includes the People's New Party, with Secretary General Hiroyuki Sonoda saying that it does not trust Kan, who also heads the DPJ, and that his party's basic policy is to continue confronting the DPJ.

The ruling coalition will need the support of at least six lawmakers from the opposition bloc to implement the fiscal 2011 budget if, as expected, the bills are voted down in the opposition- controlled House of Councillors, political analysts said.

On Friday, Sadakazu Tanigaki, president of the main opposition Liberal Democratic Party (LDP), again threatened to boycott Diet deliberations during the ordinary session set to convene in January, if Chief Cabinet Secretary Yoshito Sengoku remains in his post despite the upper house's adoption of a censure motion against him in November.

Meanwhile, the public support rate for Japanese Prime Minister Naoto Kan's Cabinet declined to around 25 percent, marking its lowest level since June when it was inaugurated, in the latest polls.