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President Barack Obama. Image courtesy of the White House/Flickr.

As the long awaited Keystone XL pipeline approval bill moves its way through Congress advisers to President Obama have recommend he veto the bill if it reaches his desk.

The White House Office of Management and Budget issued a statement Wednesday issued cementing its veto threat and said the current bill does not allow for a thorough consideration of security and environmental issues connected to the pipeline, Reuters said.

In November, a similar approval bill died in the Senate after winning House approval.

Federal regulators and lawmakers have been debating whether to approve the $8 billion Keystone XL for the past six years.

President Obama has said he is waiting for the State Department to finish its evaluation of the proposed pipeline before making a final decision.

The State Department has not disclosed when the evaluation is expected to be finished.

Calgary-based TransCanada must also win approval from the Nebraska State Supreme Court and the South Dakota Public Utilities Commission before the pipeline can go online.