Wisconsin Gov. Scott Walker Wouldn't Rule Out Re-Invasion of Iraq

— -- Wisconsin Gov. Scott Walker says he wouldn’t rule out a full-blown re-invasion of Iraq if he were to become the next commander-in-chief.

The likely Republican presidential candidate and early frontrunner in several polls said he would consider a re-invasion if it were deemed necessary to protect American national security at home and abroad.

"It would not be limited to anything out there," Walker told ABC's Jonathan Karl in an exclusive interview with for “This Week.” "Once we start saying how far we're willing to go or how many troops we're willing to invest, we send a horrible message, particularly to foes in the Middle East who are willing to wait us out."

Walker has been critical of President Obama’s handling of Iraq and Syria for its limited scope but also qualified that he does not believe in “open-ended, limitless engagements.” Though he has been sparse in offering specific changes to U.S. policy in the fight against ISIS, the likely presidential candidate said he has been deepening his understanding of international affairs in recent months.