The larger, controversial segment of the pipeline that would transport oil sands remains under review by the Obama administration.

TransCanada Corp., the developer of the controversial Keystone XL pipeline, aid Friday it has won the final major permit needed for the southern portion of the project that will bring U.S. oil from Oklahoma to Texas refiners.

The roughly 500-mile portion, now dubbed the Gulf Coast Project, has the backing of the White House, which has touted the segment in its efforts to deflect GOP attacks over President Obama’s energy policies.