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Jim Cole, Associated Press
Democratic presidential candidate Hillary Rodham Clinton listens to questions during a campaign stop ,Tuesday, July 28, 2015, in Nashua, N.H.

NASHUA, N.H. — Hillary Clinton says she will not take a position on the Keystone XL pipeline until she becomes president, citing her work on the issue as secretary of state.

Clinton told voters in New Hampshire on Tuesday that she will not "second-guess" President Barack Obama's pending decision on the pipeline. She said that would not be the "right thing to do" because the government's review of the project started during her tenure at the State Department.

Environmental organizations have spent years urging regulators to deny approval for the pipeline to ship oil from Canada's tar sands to the Gulf of Mexico.

Responding to a question about whether she would say "yes" or "no" to the pipeline, Clinton said: "If it's undecided when I become president, I will answer your question."