The new Congress hasn’t been sworn in yet, but President Barack Obama is already threatening to use veto power in 2015.

"There are going to be some areas where we disagree and, you know, I haven't used the veto pen very often since I've been in office [...] Now I suspect there are going to be some times where I've got to pull that pen out," he told NPR.

Kimberly Guilfoyle asked Charles Krauthammer if he believes Obama will act on this threat.

“I think he will act on it, and I think the Republicans ought to say, ‘Bring it on, Mr. President,’” Krauthammer told Guilfoyle.

Krauthammer said that there’s no better way for the GOP to position itself for 2016 than to show the country that they are able to enact an agenda and that they have an agenda.

First, he believes the GOP should work on "trade negotiating authority," which is an issue where the president can agree with them.

That would be a "win" for both sides, then Krauthammer suggested the Republicans should move on to more contentious issues.

"Keystone pipeline, tax reform, repealing the medical device tax, repealing the employer and individual mandates in health care reform. Let the president show where the party stands and let the country know that with a new president – a Republican president – this stuff which is very popular will be able to get through," he explained.

Krauthammer pointed out that House Republicans' bills never even made news in recent years because Harry Reid refused to even hold a vote. 

If Obama vetoes a bill to approve the Keystone pipeline, he said it will be evidence to Americans of the Democrats' "extreme environmentalism."

"There’s a whole slew of regulation coming down the pipeline out of EPA which will kill coal, heavily regulate the entire power industry, raise rates in a way that I think will be extremely unpopular and what Republicans ought to do is to target every one of those and let it come to a head and let the country have a debate. That’s the way it’s supposed to work in a democracy. But the thing is it was all shrouded and hidden when Harry Reid would prevent any of this from seeing the light of day. Well now it’s going to be seen," said Krauthammer.

Watch the full discussion above.