Missouri Democratic Senator Claire McCaskill joined Senate Republicans in a failed bid to fast-track the much-delayed international leg of the Keystone oil pipeline expansion.

McCaskill voted to support an amendment offered by Senator John Hoeven (R-N.D.), which would sidestep the need for presidential approval of the pipeline’s construction.

That move would instead have allowed Congress to approve the project.

McCaskill also supported an amendment offered by Senator Ron Wyden (D-Ore.) which would also have sped up the process for the approval of the pipeline and ensured that all oil transported by the pipeline would remain in the U.S. for domestic use.

McCaskill supports the project.

“When it comes to the Keystone pipeline, it’s not a matter of if it’s going to be built—it’s a matter of when, and where,” said McCaskill.

McCaskill recently praised the decision by TransCanada Corp. to continue the planned southern leg of the pipeline, from Cushing, Oklahoma to the Texas Gulf Coast, which she says means good jobs for American workers.

The first leg of the Keystone project already moves hundreds of thousands of barrels from the oil sands of Alberta, Canada across six states including Missouri to the refining hub in southwestern Illinois.