Team Obama on Saturday immediately seized on the release of Mitt Romney's tax returns, asking in a new web video: "What else" is the GOP nominee hiding?

"Why won't Mitt Romney come clean with the American people?" the new web video asks. "What else is he hiding?"

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The question -- which has faded in recent days -- reemerged Friday with the release of Romney's 2011 tax return and 20-year average tax rate and appears to be gaining steam again in the Obama campaign.

An e-mail from the campaign on Saturday notes that Romney's tax return includes 813 pages of which 65 percent "deal with overseas investments" including substantial investments in a Chinese oil company and what the dozens of foreign bank accounts, "millions of dollars stashed away in notorious tax havens."

The video also highlights that while Romney falls behind the longstanding precedent of releasing returns. He has only made 2 years of tax returns available to the American public, while his father George Romney released 12 years of tax returns, and former presidents George H.W. Bush released 19 years of returns, Bill Clinton William (Bill) Jefferson ClintonChanging the climate of presidential debates Davis: My advice to Joe Biden on eve of the debate — be Joe Biden Is Congress reasserting itself? MORE 16 years and George W. Bush 13 years, respectively.

President Obama has also made 12 years of his returns public.

"Why wont Mitt Romney match other presidential candidates including his father?" the video asks. Advisers to the campaign are expected to pose the question further in the coming days. Democratic advisers say they also expect the campaign will press Romney on the foreign taxes he paid in 2011. And they will ask about his ties to Bain Capital, the private equity firm he helped create.

Romney campaign spokeswoman Amanda Henneberg said, “with a failed record marked by job loss and middle-class suffering, President Obama has nothing to offer but cheap political attacks.

“He once said politicians who can’t run on their record ‘make a big election about small things.’ With 23 million Americans struggling for work and Washington as broken as ever, President Obama has proven incapable of bringing the change he promised," Henneberg added.

--This story was posted at 9:13 a.m. and last updated at 12:04 p.m.