Fellow Republican candidate Jeb Bush has refused to rule out resuming the use of torture techniques employed under his brother, former President George W. Bush. Bush made the comments in response to a question in Iowa last week.

Questioner: “Do you believe that the CIA engaged in torture by the common definition, and would you bring those techniques back under any circumstances as president?”

Jeb Bush: “I don’t want to make a definitive, blanket kind of statement. This is something that is actually — I’m not struggling with. It’s — I’m running for president, not running for the Senate or running for, you know, governor. When you’re president, your words matter, and I’m cautious about making commitments without having all the facts, because this is a serious undertaking.”

The super PAC supporting Bush’s presidential bid will reportedly spend $10 million on its first major TV ad campaign beginning next month. Meanwhile, Trump has said he is willing to spend $1 billion of his own money on his campaign.