WASHINGTON - US President Barack Obama's campaign and top Democrats on Sunday called on Mitt Romney to release more personal tax records and raised questions about his offshore assets that the Republican challenger's campaign condemned as an "unseemly and disgusting" character assault.

Democrats and Republicans tussled over the economy, but it was Romney's offshore assets that Democrats seized on during the Sunday talk shows in their quest to portray him as a wealthy man out of touch with ordinary Americans. Romney faces Obama in the Nov. 6 election and polls indicate a close race.

Democratic National Committee Chairwoman Debbie Wasserman Schultz raised the issue on "Fox News Sunday" as her interview time ran out.

"I'd really like to see Mitt Romney release more than one year of tax records, because there's been disturbing reports recently that he's got a Bermuda corporation, a secretive Bermuda corporation that no one knows anything about, investments in the Caymans, kind of Swiss bank account."

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