Stephen Harper’s government is taking aim at NDP Leader Thomas Mulcair, accusing him of not supporting Canadian interests on his recent trip to the United States.

Mulcair is in Washington meeting with American business leaders and politicians.

The issue for the Harper government is not that Mulcair is speaking out against the proposed Keystone XL pipeline, but instead his lack of outward support for it.

Mulcair has said he doesn’t want to discuss the topic because it is now a decision for the Obama administration, and he does not want to interfere with that.

Natural Resources Minister Joe Oliver, however, says Mulcair should be out there endorsing the pipeline.

“At the minimum, the NDP’s leaders ambivalence and vagueness on this critical issue in Washington is not helpful, especially at a crucial moment for a decision by the U.S. administration,” Oliver said.

The NDP, meanwhile, has been pushing for an all-Canadian pipeline, arguing we’d create more jobs if we ship our oil from west to east, rather than sending it south.