"Certainly waterboarding at a minimum. They're chopping off heads of Christians and many other people in the Middle East. They're chopping heads off," Trump told ABC News in an interview, a day after he performed well during the last GOP presidential debate in New Hampshire.
"They laugh at us when they hear that we're not going to approve waterboarding, and then they will have a James Foley (US hostage) and others where they cut off their heads. I have no doubt that it does work in terms of information and other things, and maybe not always, but nothing works always. But I have no doubt that it works," he said to a question.
As per the latest polls, he is slated to win the New Hampshire primary on Tuesday.
Trump in another interview on CNN asserted that such harsh techniques would be a very good tool against terrorists.
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"I would absolutely authorise something beyond waterboarding. And believe me, it will be effective. If we need information you have our enemy cutting heads off of Christians and plenty of others, by the hundreds, by the thousands," Trump said.
"We're going to do things beyond waterboarding perhaps, if that happens to come. But when you have conditions like that, I would say absolutely, I would approve waterboarding and if you go beyond it, I'm OK with that," Trump said when he was asked "So we're going to chop off heads..." on the brutal executions by the Islamic State (IS) terror group.
Trump said he will convene his top generals and give them
a simple instruction: they will have 30 days to submit to the Oval Office a plan for defeating Islamic State (ISIS).
"Any nation who shares in this goal will be our friend in this mission," he said.
"For years, we have been caught up in endless wars and conflicts under the leadership of failed politicians and a failed foreign policy establishment in Washington DC. The same people who made every wrong decision in Iraq, Afghanistan, Libya, Syria, Egypt, China and Russia are the same people who are advising Hillary Clinton," Trump said.
Trump said he believes in a foreign policy based on national interests that focuses on American security and regional stability - instead of using the military to create Democracies in countries with no Democratic history.
"We will work to form partnerships overseas based on a long-term strategy of defeating Radical Islamic Terrorism," he said.
Trump said as part of his plan to avoid and prevent foreign conflicts, he will rebuild the depleted military.
"This is the ultimate deterrent. I will ask Congress to eliminate the sequester and immediately re-invest in our military. Right now, we have the smallest air force since 1947, the smallest army since 1939, and one of the smallest Navy's since 1917," he said.