Vermont Sen. Bernie Sanders announced his opposition to a new natural gas pipeline project in the northeastern states.

A long-time critic of the Keystone XL pipeline, the Democratic presidential candidate reminded the audience at the Jefferson-Jackson Dinner in Manchester, N.H., that he believes climate change is the greatest challenge facing the U.S.

"And that is why — right here in New Hampshire — I believe the Northeast Energy Direct pipeline that would carry fracked natural gas for 400 miles through 17 communities is a bad idea — and should be opposed," Sanders said in prepared remarks.

The Tennessee Gas Pipeline Company, a Kinder Morgan company, filed an application with the Federal Energy Regulatory Commission on Nov. 20 to build its proposed natural gas pipeline, called the "Northeast Energy Direct Project."

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