DAVENPORT, Iowa — Republican presidential candidate Jeb Bush on Thursday declined to rule out resuming the use of torture under some circumstances by the U.S. government.

“I don’t want to make a definitive, blanket kind of statement,” Bush told an audience of Iowa Republicans, when asked whether he would keep in place or repeal President Obama’s executive order banning so-called enhanced interrogation techniques by the CIA.

“This is something that I’m actually struggling with because I’m running for president … and when you are president your words matter,” he said.

The former Florida governor said that in general, he believes torture is inappropriate, and that he was glad that his brother, former President George W. Bush, largely ended the CIA’s use of the techniques before he left office.

The CIA used waterboarding, slapping, nudity, sleep deprivation, humiliation and other methods to coerce al-Qaida detainees – methods the military would be prohibited from using on prisoners of war.

A Senate report released last year cited CIA records in concluding that the techniques were more brutal than previously disclosed, that the CIA lied about them, and that they failed to produce unique, life-saving intelligence. The CIA and its defenders take issue with the report.

Jeb Bush said he believed that the techniques were effective in producing intelligence, but that “now we’re in a different environment.”

He suggested there may be occasions when brutal interrogations were called for to keep the country safe. “That’s why I’m not saying in every condition, under every possible scenario,” he said.

Bush has been walking a careful path, seeking to disassociate himself from some of the unpopular aspects of his brother’s legacy while praising him.

In discussing the Iraq war, Bush, who previously acknowledged that the intelligence didn’t support the decision to invade, said Thursday he had learned from some of the mistakes made during the occupation, including what he said was a wrong decision to disband the Iraqi military. He said his brother also now believes that was a mistake.

Bush blames the rise of the Islamic State on what he said was Obama’s failure to negotiate an agreement to leave U.S. troops there in 2011.

He repeated his call for a more aggressive posture toward the Islamic State but, like the Obama administration, he opposes sending in regular U.S. ground forces. He does favor putting special operations troops on the battlefield.