President Obama should follow the lead of his own State Department who said on December 12th, 2011:
“Should Congress impose an arbitrary deadline for the permit decision, its actions would not only compromise the process, it would prohibit the Department from acting consistently with National Environmental Policy Act requirements by not allowing sufficient time for the development of this information”...“In the absence of properly completing the process, the Department would be unable to make a determination to issue a permit for this project."
The President shouldn't approve the pipeline in 60 days time because it is not in the "national interest" and would not allow the State Department ample time to complete a Supplemental Environmental Impact Statement (SEIS) in accordance with NEPA.