Trump, who is the frontrunner to win the Republican presidential nomination, has made a series of controversial remarks about America's struggle with the Islamic State group and other jihadists.
Last week, he told a crowd in South Carolina that "waterboarding is fine, but it's not nearly tough enough," and last year he said that as president, he would order the United States to "take out" the families of terror suspects.
Speaking at a House Appropriations Committee meeting, Democratic Congresswoman Betty McCollum asked General Joe Dunford, the Pentagon's chairman of the joint chiefs of staff, what he thought of Trump's "rants."
"He says he will order our military to take out the families of Islamic terrorists. I presume that means directing the secretary of defense and the chairman of the joint chiefs of staff to use men and women under your military command to intentionally kill innocent family members including children."
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But Defense Secretary Aston Carter interjected before Dunford could answer, saying it would be inappropriate to comment on such matters.
"This is an election year," Carter said. "I feel very strongly that our department needs to stand apart from the electoral season."
"I'm assuming the values of the American people do not include torture," McCollum said.