Senate GOP leaders are flexing their constitutional muscles with a new push for approval of the Keystone XL oil sands pipeline.

Citing Congress’s powers under the Commerce Clause, Senate Republicans floated legislation Monday that would bypass the Obama administration and approve TransCanada Corp.’s pipeline to carry oil sands crude from Alberta to Gulf Coast refineries.

The bill goes further than the GOP provision in December’s payroll tax cut deal, which simply imposed a deadline for a decision on the Obama administration — one that President Obama met early when he rejected the project on Jan. 18.