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WASHINGTON (CNN) — The Canadian firm proposing the massive Keystone XL pipeline said Monday it was asking the U.S. State Department to halt its review of the project as it waits out a separate process at the state level.

If the State Department complies, it could push the final decision on Keystone past 2016 — meaning it would be passed from President Barack Obama, who’s widely expected to reject the project — to his successor.

TransCanada wrote in a statement it would be “appropriate” for Secretary of State John Kerry to suspend the current review of the Keystone proposal as Nebraska’s public service commission deliberates over the pipeline’s route.

The company said it could take up to 12 months for the Nebraska process to be completed, adding further delay to an approval process that’s already taken seven years.

Ahead of TransCanada’s announcement, the White House said Monday it expected Obama to make a final determination on Keystone before he leaves office, though wouldn’t specify whether that meant this year or next.

Most pro-Keystone advocates have largely resigned themselves to a rejection from the White House, given Obama’s past statements casting skepticism that the project would create enough jobs to outweigh the potential environmental risks.

Proponents say the pipeline, which would carry oil from the tar sands of Alberta to the Gulf of Mexico, would advance energy independence in North America.

But environmentalists say the risks of leaks and spills are too great, and say the project would only deepen dependence on fossil fuels.

After TransCanada’s statement, anti-Keystone groups cast the decision as a last-ditch ploy to avoid what appears would be an unfavorable decision on the pipeline.

“After nearly seven years of trying to force the President’s hand to approve the Keystone XL pipeline, TransCanada is now desperately trying to block President Obama from even making a decision at all,” Elijah Zarlin, director of the CREDO Climate Campaigns, said in a statement. “This is yet another victory for the overwhelming grassroots opposition along the route and across the country.”