WASHINGTON — Defense Secretary Leon Panetta says he "sure as hell" hopes that automatic, across-the-board cuts in military spending don't happen.

Panetta repeatedly has warned about a catastrophic impact from the cuts, and he issued a fresh warning Wednesday at a congressional hearing.

The $1.2 trillion cuts to defense and domestic programs are set to begin Jan. 2 unless Congress can come up with an alternative.

The Pentagon would face a decade-long reduction of nearly $500 billion in projected spending. And that's on top of the $492 billion reduction in defense over 10 years that President Barack Obama and congressional Republicans agreed to last summer.

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Republican candidate Mitt Romney has criticized Obama for the expected cuts. The president pointed out that Republicans voted for them.

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