Republicans vowed to continue aggressively pushing for approval of the Keystone XL oil pipeline Thursday shortly after the Senate narrowly rejected a GOP-backed measure to greenlight the project.

The Senate Republicans who authored the Keystone provision told reporters they are working with House GOP leadership to ensure that a measure fast-tracking approval of the project is ultimately attached to the highway bill.

“We intend to continue our efforts, including on this bill,” Sen. John Hoeven (R-N.D.) told reporters shortly after the Senate Keystone vote. “Remember, we’re going to have to come to an agreement with the House, and I believe there is strong support for the Keystone XL pipeline project in the House as well.”