WASHINGTON – Despite early signs of robust sales, White House economists warned Monday that the uncertainty of a potential hike in taxes next year for middle class taxpayers under the looming fiscal cliff could hurt consumer confidence during the crucial holiday shopping season.

In a new report that coincides with Congress' return after the Thanksgiving holiday, the White House says that if lawmakers don't halt the automatic increase in taxes for households earning less than $250,000, consumers might even curtail their shopping during the current holiday season.

"As we approach the holiday season, which accounts for close to one-fifth of industry sales, retailers can't afford the threat of tax increases on middle-class families," the report by President Barack Obama's National Economic Council and his Council of Economic Advisers says.