Donald Trump database Muslims_00001319.jpg
NBC News
Donald Trump database Muslims_00001319.jpg
Now playing
00:45
Trump would 'certainly implement' database for Muslims
Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
Win McNamee/Getty Images
Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
Now playing
01:44
Jill Stein raises millions for recount
Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
BRENDAN SMIALOWSKI/AFP/Getty Images
Former Democratic US Presidential candidate Hillary Clinton speaks to staff and supporters at the New Yorker hotel after her defeat in the presidential election November 9, 2016 in New York. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Now playing
02:14
Scientists urge Clinton to call for recount
LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
Matt Mills McKnight/Getty Images North America/Getty Images
LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
Now playing
03:25
Donald Trump's wild ride
Now playing
01:46
Trump's challenges in the Middle East
donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg
donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg
Now playing
02:47
Fact checking Trump on crimes by immigrants
Mark Makela/Getty Images/Lintao Zhang/Getty Images
Now playing
01:26
Trump vs. the tape on Obama and the protester
Now playing
01:28
Trump compares Clinton email probe to Watergate
Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
John Locher/AP
Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
Now playing
01:20
Donald Trump rushed off stage by Secret Service
AFP/Getty Images
Now playing
02:16
Trump reads letter from Patriot's coach at rally
US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.
Mandel Ngan/AFP/Getty Images
US Republican presidential nominee Donald Trump speaks during rally at the Atkinson Country Club in Atkinson, New Hampshire on November 4, 2016.
Now playing
01:56
Trump on US officials: 'What a group of losers'
donald trump nice and cool pensacola fl bts_00001523.jpg
donald trump nice and cool pensacola fl bts_00001523.jpg
Now playing
00:49
Trump's mantra in campaign's final week: Stay on point
donald trump nice to hillary clinton and democrats orig cm_00000000.jpg
donald trump nice to hillary clinton and democrats orig cm_00000000.jpg
Now playing
01:52
Audio of Trump praising the Clintons and Democrats
cuomo lewandowski hillary clinton email exchange newday_00002327.jpg
cuomo lewandowski hillary clinton email exchange newday_00002327.jpg
Now playing
01:28
Cuomo grills Lewandowski on Clinton email 'hypocrisy'
Now playing
01:49
Meet the other Hillary Clinton and Donald Trump

Story highlights

"I would certainly implement that. Absolutely," Trump told NBC News

Trump also said this week he would consider shutting down mosques

Washington CNN —  

Donald Trump on Thursday called for the creation of a national database to register all Muslims living in the U.S. to protect the country against terrorism.

“I would certainly implement that. Absolutely,” Trump told NBC News during a campaign stop in Newton, Iowa.

He continued: “There should be a lot of systems, beyond databases. We should have a lot of systems.”

Trump, who also said this week that he would consider shutting down mosques, told Yahoo News earlier Thursday that “we’re going to have to look at a lot of things very closely” when asked about a national database for Muslims.

Those answers seemed at odds with a follow-up question from CNN’s Sara Murray in Newton. When Murray asked whether Trump would rule out a database for Muslims, he said he didn’t “know where you heard that.”

“Yahoo News asked you about it, you didn’t rule it out,” Murray said as Trump worked a ropeline after the event.

“No, I never – I never responded to that question,” Trump said.

“So would you not support it?” Murray asked.

“I never responded to that question, Sara,” Trump said.

He added that he didn’t “know who wrote it,” referring to the Yahoo News article, and declined to answer a follow-up question from Murray about whether he would “support something like that,” referring to a Muslim database. He also declined to respond when Murray asked “what’s your view of it?” as he continued down the ropeline.

His spokeswoman Katrina Pierson said Friday on Fox Business that Trump “is just saying he won’t rule anything out.”

“Those are a reporters’ words and now everyone is saying it’s all Trump. He’s simply saying he won’t take anything off the table,” Pierson said.

When the anchor pressed her, suggesting a religion-based database isn’t something that is done in the U.S., Pierson said “we don’t do that, but we do have a watch list, a terrorism watch list.”

Trump has repeatedly suggested it would be “insane” to allow Syrian refugees into the U.S. for fear that terrorists could infiltrate their ranks and slammed President Barack Obama for his plans to resettle 10,000 Syrian refugees in the United States over the next year.

“I think he’s a threat to our country. I mean he must have some kind of a thing going because, you know, when you see that he won’t even call them by their name, attack after attack after attack,” Trump said Wednesday on Boston’s WRKO radio. “It’s radical Islamic terrorism and he won’t even acknowledge it – it’s like they’re coming out of Denmark or something.”

Trump added that Obama “doesn’t have any clue” when it comes to defeating ISIS.

The Republican front-runner’s attack on the president came after Obama had slammed Republicans’ calls to stop admitting any Syrian refugees into the United States as “offensive,” “political posturing” and a “potent recruitment tool” for ISIS.

“We are not well served when, in response to a terrorist attack, we descend into fear and panic,” Obama said earlier on Wednesday. “We don’t make good decisions if it’s based on hysteria or an exaggeration of risks.”

Keith Ellison: Community to ‘assert Muslim-Americanness’

Trump also slammed Hillary Clinton for not labeling the terrorist threat the U.S. faces as “radical Islam.”

But Trump went beyond knocking Clinton for the language she uses in discussing the threat of terrorism, suggesting she lacks the “strength or the stamina” to lead the country.

“She doesn’t have the strength, she doesn’t have the stamina,” Trump said. “Hillary does not have the strength or the stamina to be president, and she doesn’t have the ideas.”

Words of contempt, acts of love for Muslims after Paris attacks

In a separate interview, Trump knocked ripped Democratic presidential candidate Bernie Sanders as a “communist.”

“I think he’s a communist. I think he’s actually a communist with a socialistic bent,” Trump told Yahoo News. “Anybody that would say that the Paris attacks were caused by global warming, there’s something missing.”

Sanders calls himself a “democratic socialist” and has said that he believes the greatest threat facing the country is global warming, and he linked climate change to unrest in the Middle East in the last Democratic debate.

CNN’s Dan Merica and David Wright contributed to this report.