The Senate voted 62-36 to allow construction of the $US5.4 billion project, which would transport crude oil from Canada to the US and allow Canadian and American oil producers more access to the larger refining markets in US’s Midwest and Gulf Coast regions.

The US House of Representatives recently passed a bill for the pipeline, whilst President Obama signalled he would veto bipartisan congressional legislation to build the pipeline. According to Reuters, the Republican Senate is now several votes shy of the two-thirds majority required to override this veto, should Obama follow through.

The US State...