The United States should not be the world's policeman, Republican presidential candidate Scott Walker told the Washington Examiner, in an exclusive interview.

The Wisconsin governor seeking to replace President Obama in the White House outlined a tough but judicious approach to the use of American military might.

"In terms of the use of force, there has to be a high standard," Walker told the Examiner. "I think there should be a high bar, and it shouldn't be about nation-building or being the world's policeman. It should be about protecting our national security interests."

Walker said threats to the "American homeland," or to allies or to "areas where Americans trade or travel" would be among his criteria for determining whether the military should take "force-specific" action.

"I think that military is appropriate to use when we've had a threat abroad from radical Islamic terrorism or other terrorism-related threats," Walker added. "We need to act to take that out before they encroach on American soil."

Walker joined his fellow Republican primary candidates in slamming President Obama's leadership and nuclear agreement with Iran.

"We'd pull back on the bad Iran deal and have the support of Congress to not only reinstate sanctions, but to put in place even more crippling sanctions, and convince our allies to do the same," Walker said of how he would work with lawmakers in Washington to defeat the deal.

Congress has 60 days to approve or reject the president's nuclear agreement with Iran. Obama has vowed to veto any legislation that would dismantle the deal, which is his signature international agreement.

Walker steered a middle ground between the consistently hawkish stance of other candidates, such as Sen. Lindsey Graham, and the more anti-interventionist Sen. Rand Paul.

"I'll only send our men and women in uniform in if national security is at risk," Walker said. "Those men and women will know if they're deployed that they'll have the support of me and the American people going forward."