WASHINGTON (AP) -- Congress is considering whether to set aside more than 2 million acres in nine states as wilderness in an early showdown that threatens to derail pledges by Senate leaders to work cooperatively as a new administration takes office.

The largest expansion of wilderness protection in 25 years has bipartisan support and would include California's Sierra Nevada mountain range, Oregon's Mount Hood, Rocky Mountain National Park in Colorado and parts of the Jefferson National Forest in Virginia.

The bill stalled last year over concerns about it's $4 billion price tag over five years.

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