Massachusetts’ two U.S. senators are planning to vote against the Keystone XL pipeline project.

Senators Elizabeth Warren and Edward Markey say they’re opposed to the crude-oil pipeline, which would run from Canadian tar sands to Gulf coast refineries.

Markey argued on the Senate floor the pipeline would enable Canadians to export oil out of the United States. 

"We take all the environmental risk.  This oil goes out of our country. It's going to travel from the dirtiest tar sands fields in Canada through a pipeline like a straw through the united states down through the Gulf of Mexico and then exported out of the United States of America."

Markey has said he's tried to counter that by offering amendments that would require the oil transported through the pipeline to stay in the United States.

Markey called the pipeline a way for oil companies to use America as a middleman for the energy interests of other countries.