"Through this bill, the United States Congress attempts to circumvent longstanding and proven processes for determining whether or not building and operating a cross-border pipeline serves the national interest," he wrote in his veto message.
Obama has played down Keystone XL's ability to create jobs and raised questions about its effects on climate change. Environmentalists, who made up part of the coalition that elected the president in 2008 and 2012, oppose the project because of carbon emissions involved in getting the oil it would carry out of Canadian tar sands.
“The president’s veto of the Keystone jobs bill is a national embarrassment," said Republican House Speaker John Boehner. "The president is just too close to environmental extremists to stand up for America’s workers. He’s too invested in left-fringe politics to do what presidents are called on to do, and that’s put the national interest first."