Nearly two-thirds of Americans believe torture can be justified to extract information from suspected terrorists, according to a new poll.
The Reuters/Ipsos poll reflects a US public on edge after the massacre of 14 people in San Bernardino and large-scale attacks in Europe, including a bombing claimed by Islamic State last week that killed at least 32 people in Belgium.
Donald Trump, the front-runner for the Republican presidential nomination, has forcefully injected the issue of whether terror suspects should be tortured into the election campaign.
Trump has said he would seek to roll back President Barack Obama's ban on waterboarding - an interrogation technique that simulates drowning that human rights groups contend is illegal under the Geneva Conventions.
Trump has also vowed to "bring back a hell of a lot worse" if elected.
Trump's stance has drawn broad criticism from human rights organisations, world bodies and political rivals.
But the poll findings suggest many Americans are aligned with Trump on the issue, although the survey did not ask respondents to define what they consider torture.
"The public right now is coping with a host of negative emotions," said Elizabeth Zechmeister, a Vanderbilt University professor who has studied the link between terrorist threats and public opinion.
"Fear, anger, general anxiety: (Trump) gives a certain credibility to these feelings," she said.
The March 22-28 online poll asked respondents if torture can be justified "against suspected terrorists to obtain information about terrorism."
About 25 percent said it is "often" justified while another 38 percent it is "sometimes" justified. Only 15 percent said torture should never be used.
Republicans were more accepting of torture to elicit information than Democrats: 82 percent of Republicans said torture is "often" or "sometimes" justified, compared with 53 percent of Democrats.
About two-thirds of respondents also said they expected a terrorist attack on US soil within the next six months.