New video offers a glimpse inside federal agency's lavish Las Vegas conference The General Services Administration is accused of overspending It is accused of spending $500,000 on iPods and digital cameras for employees The Huffington Post obtained a video of its lavish Las Vegas conference The Huffington Post says the video came from an administration official (CNN) -- Congressional investigators are accusing the General Services Administration of violating its employee gift limit with rewards of iPods, digital cameras and other electronics, just as a video emerged of a lavish conference that shows employees drinking and making jokes about wasteful spending. The video, obtained by The Huffington Post on Friday, offers a glimpse inside the agency's $820,000 conference in Las Vegas. It has prompted taxpayer outrage, embarrassed the administration and put a spotlight on the wasteful spending by the agency that acts as a real estate agency for the federal government. The latest news comes just days after the Office of the Inspector General documented massive overspending by the GSA. The fallout from the report's revelations has sparked a congressional investigation and seen the GSA chief step down, two other employees fired and a number of others suspended. On Friday, Republican investigators for the House Transportation and Infrastructure Committee said the GSA's Public Buildings Service developed an employee incentive program known as the "Hats Off Store" that spent nearly $500,000 on gifts -- from iPods to GPS devices -- that vastly exceeded its $99 per-gift limit. They also said accounting for the gifts as well as the justification for giving them were lacking or inconsistent, according to a statement released by Rep. Jeff Denham, R-California, chairman of the Subcommittee on Economic Development, and Rep. John Mica, R-Florida, chairman of the transportation committee. While the investigation found the GSA's massive spending began in 2007 under the Bush administration and continued under the current leadership, Republican congressmen leading the investigation have hammered President Barack Obama over the allegations. "More and more information is coming out about the total lack of accountability and outrageous spending habits of the General Services Administration," Denham said in the statement. Denham accused the administration of treating taxpayer dollars "life their own private slush fund." Meanwhile, House Oversight Chairman Darrell Issa, R-California, has accused the White House of sitting on the IG's findings about the GSA for 11 months. The administration has dismissed Issa's claims, saying the investigation followed proper procedures. The allegations Friday by Denham and Mica, and the video made public by The Huffington Post are likely to inflame the political divide. The video clips posted online by The Huffington Post, which it said was provided by an administration official, shows employees at the GSA's 2010 Western Regions Conference in Las Vegas putting on magic shows and singing Frank Sinatra songs. In one clip, a person dressed as a clown talks about making work more difficult for others. "Government, if you think the problems we create are bad, just wait until you see our solutions," the clown warns the audience. CNN cannot independently verify the authenticity of the video. The reports of overspending have prompted a bipartisan reaction, with Sen. Barbara Boxer, D-California, the chair of the Senate Environment and Public Works Committee, saying she will hold hearings on the GSA findings next week. CNN's Dana Bash and Deirdre Walsh contributed to this report.