WASHINGTON With the US Congress about to take up a war funding bill, President Barack Obama is on the defensive as the leaked six-year archive of classified military documents revealed a Afghanistan war bleaker than officials let on. The leaders of the House of Representatives were moving to conduct a vote on a war funding bill as soon as Tuesday, concerned about the disclosure of the classified information would fuel opposition to the measure, The New York Times reported. A Senate panel also was to begin confirmation hearings Tuesday on President Obamas nominations to lead the Central Command, Gen. James Mattis, who would oversee military operations in Afghanistan. The leaks show that the ongoing war is worse than portrayed by officials from either former President George Bushs administration or the Obama administration, and come as policymakers debate the U.S. presence in Afghanistan. White House officials concede the documents, distributed by WikiLeaks.org, would make it harder for Obama as he tries to rally public and congressional support for the war until the end of the year, when he has scheduled a review of the effort, the Times said. We dont know how to react, one administration official said Monday. This obviously puts Congress and the public in a bad mood. Three officials separately told the Times that they hoped the administration could use the documents to gain more help from Pakistan, with two going so far as suggesting Pakistan could be warned that American aid may be withheld. This is now out in the open, a senior official said. Its reality now. In some ways, it makes it easier for us to tell the Pakistanis that they have to help us. Some of these documents reinforce a longstanding concern of mine about the supporting role of some Pakistani officials in the Afghan insurgency, said Sen. Carl Levin, a Democrat, chairman off the Armed Services Committee. Pakistani officials deny such links. Julian Assange, whose WikiLeaks.org provided access to about 92,000 secret military reports from January 2004 through December 2009, defended release of the documents during a news conference Monday in London. Id like to see this material taken seriously and investigated, and new policies, if not prosecutions, result from it, he said.