The eight GOP hopefuls put several countries on notice if they are able to take the White House from President Barack Obama.

At the top of the list are Pakistan, for its uncertain loyalties, and Iran, for its threat of future nuclear warfare.

Newt Gingrich and Rick Santorum had the toughest talk when it comes to stopping America's enemies at all costs. Both candidates said they support the covert assassination of scientists to avoid development of nuclear weapons.

Most of the candidates agreed that waterboarding is an acceptable interrogation technique.