Gov. Dave Heineman has signed a bill that will allow the state to proceed with its review of the proposed Keystone XL pipeline through Nebraska.

The Republican governor signed the measure Tuesday, declaring the review process a top priority for his state.

The state review stopped in January, when President Barack Obama denied a permit for the project after congressional Republicans tried to force his hand. Environmental groups strongly oppose the proposed crude oil pipeline, which would travel through Nebraska on a Canada-to-Texas route.