The White House reiterated on the first day of the new Congress that the president will veto legislation to approve the Keystone pipeline.

Legislation, supported by several Senate Democrats, is expected to move through Congress as early as this week.

The pipeline would carry crude oil from Canada to U.S. refineries.

White House Press Secretary Josh Earnest appeared on "America's Newsroom" this morning and was challenged by Bill Hemmer on the veto threat. 

Hemmer noted that more than two-thirds of Americans support the construction of the pipeline, according to a Fox News poll last month. 

And he asked Earnest about the strategy of issuing a veto threat on Day 1 of the new Congress, while also promising to work with Republicans. 

Earnest answered that the GOP agenda to immediately work on Keystone raises questions about their willingness to work with President Obama, since the president has already said he'd veto the legislation.

Earnest said there is already a process, which predates this administration, for evaluating infrastructure projects that cross international borders. 

"I don't understand why Congress would wade into a process that is already ongoing, where we are able separate politics from the equation," he said.

Watch the discussion above.

Earlier on "Fox and Friends," Brian Kilmeade talked to Sens. John Hoeven (R-ND) and Joe Manchin (D-WV), who are co-sponsoring the Senate's bill. 

To override the veto, the Senate would ultimately need more Democrats to go against the president in order to get to 67 votes. 

Manchin said he's "very disappointed" in the president's response, and is hoping that after some amendments are offered, more Democrats will join the effort.

He called on the president to get involved in the effort to improve the bill, instead of just turning it down.

"We had other Senators talking about good amendments they wanted to put on and the Republicans were going to consider that. You would have thought that at least the White House and the president would say, 'Let's go through this process and let that play out and at the end of the day, I'll tell you why or why I do not support it," said Manchin. 

Watch the interview below: