PHOTO: Getty Images
Now playing
01:19
WSJ: Kim Jong Un's slain half-brother was CIA source
Barrie
Barrie's aunt speaks about how the police brought her the news about the death of her nephew Ibrahima.
PHOTO: VTM
Now playing
01:26
Aunt of Black man who died after arrest in Belgium: We want justice
screengrab US social media
screengrab US social media
PHOTO: Getty Images
Now playing
04:35
Tech companies ban Trump, but not other problematic leaders
Now playing
01:23
Rejected Tintin cover breaks world record for comic book art
WASHINGTON, DC - JANUARY 13:  Speaker of the House Nancy Pelosi (D-CA) presides over the vote to impeach U.S. President Donald Trump for the second time in little over a year in the House Chamber of the U.S. Capitol January 13, 2021 in Washington, DC. The House voted to impeach Trump on the charge of "incitement of insurrection," 232-197 after a mob of his supporters attacked the U.S. Capitol where Congress was working to certify the Electoral College victory of President-elect Joe Biden on January 6. 10 Republicans voted to impeach. (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - JANUARY 13: Speaker of the House Nancy Pelosi (D-CA) presides over the vote to impeach U.S. President Donald Trump for the second time in little over a year in the House Chamber of the U.S. Capitol January 13, 2021 in Washington, DC. The House voted to impeach Trump on the charge of "incitement of insurrection," 232-197 after a mob of his supporters attacked the U.S. Capitol where Congress was working to certify the Electoral College victory of President-elect Joe Biden on January 6. 10 Republicans voted to impeach. (Photo by Chip Somodevilla/Getty Images)
PHOTO: Chip Somodevilla/Getty Images
Now playing
02:35
How the world is reacting to Trump's second impeachment
Indonesia sriwijay air crash search for victims wang pkg intl hnk vpx_00000920.png
Indonesia sriwijay air crash search for victims wang pkg intl hnk vpx_00000920.png
Now playing
02:21
Family members wait in anguish as search for crash victims continues
africa china coronavirus vaccine diplomacy lu stout pkg vpx _00025522.png
africa china coronavirus vaccine diplomacy lu stout pkg vpx _00025522.png
PHOTO: CCTV
Now playing
03:09
How China is hoping to use its vaccine as a diplomatic tool
PHOTO: CIRO FUSCO/AFP/ANSA/AFP via Getty Images
Now playing
00:38
Huge sinkhole appears in Italian hospital parking lot
TOPSHOT - Rescue workers carry recovered debris at the port in Jakarta on January 10, 2021, during the search operation for Sriwijaya Air flight SJY182 which crashed after takeoff from Jakarta on January 9. (Photo by Dany Krisnadhi / AFP) (Photo by DANY KRISNADHI/AFP via Getty Images)
TOPSHOT - Rescue workers carry recovered debris at the port in Jakarta on January 10, 2021, during the search operation for Sriwijaya Air flight SJY182 which crashed after takeoff from Jakarta on January 9. (Photo by Dany Krisnadhi / AFP) (Photo by DANY KRISNADHI/AFP via Getty Images)
PHOTO: Dany Krisnadhi/AFP/Getty Images
Now playing
02:16
Indonesian jetliner crashes after taking off from Jakarta
 HONG KONG PRO DEMOCRACY ACTIVIST VENTUS LAU BEING ESCORTED BY POLICE.
HONG KONG PRO DEMOCRACY ACTIVIST VENTUS LAU BEING ESCORTED BY POLICE.
PHOTO: VENTUS LAU FACEBOOK PAGE/Reuters
Now playing
03:15
See Hong Kong police arrest former pro-democracy lawmakers
Tensions between the United States and Iran are likely to further escalate once again after Tehran seized a South Korean-flagged chemical tanker in the Persian Gulf, according to semi-official Iranian news agencies, and announced it had resumed enriching uranium to 20% purity, far beyond the limits laid out in the 2015 nuclear deal. President Donald Trump walked away from the agreement in 2018. CNN
Tensions between the United States and Iran are likely to further escalate once again after Tehran seized a South Korean-flagged chemical tanker in the Persian Gulf, according to semi-official Iranian news agencies, and announced it had resumed enriching uranium to 20% purity, far beyond the limits laid out in the 2015 nuclear deal. President Donald Trump walked away from the agreement in 2018. CNN's Paula Hancocks reports.
PHOTO: YJC
Now playing
02:37
Footage shows chemical tanker seized by Iranian forces
A European health worker prepares a shot of the coronavirus vaccine.
A European health worker prepares a shot of the coronavirus vaccine.
PHOTO: Reuters
Now playing
02:14
Frustration in Europe over pace of coronavirus vaccine rollout
Jack Ma, the co-chair of the UN High-Level Panel on Digital Cooperation, founder of Alibaba Group, attends the Bund Summit in Shanghai. He says that the essence of finance is credit management. We must change the pawnshop idea of Finance and rely on the credit system. Shanghai, China, 24 October 2020.

Jack Ma, the co-chair of the UN High-Level Panel on Digital Cooperation, founder of Alibaba Group, attended the Bund Summit in Shanghai. He says that the essence of finance is credit management. We must change the pawnshop idea of Finance and rely on the credit system.No Use China. No Use France.
Jack Ma, the co-chair of the UN High-Level Panel on Digital Cooperation, founder of Alibaba Group, attends the Bund Summit in Shanghai. He says that the essence of finance is credit management. We must change the pawnshop idea of Finance and rely on the credit system. Shanghai, China, 24 October 2020. Jack Ma, the co-chair of the UN High-Level Panel on Digital Cooperation, founder of Alibaba Group, attended the Bund Summit in Shanghai. He says that the essence of finance is credit management. We must change the pawnshop idea of Finance and rely on the credit system.No Use China. No Use France.
PHOTO: Zhao Yun/Oriental Image/Reuters
Now playing
03:05
Chinese tech tycoon has not been seen in months
Now playing
02:19
Country has 2nd highest Covid-19 cases. See their vaccine plan
Swedish environmentalist Greta Thunberg arrives for a meeting at the Europa building in Brussels on March 5, 2020. (Photo by Kenzo TRIBOUILLARD / AFP) (Photo by KENZO TRIBOUILLARD/AFP via Getty Images)
Swedish environmentalist Greta Thunberg arrives for a meeting at the Europa building in Brussels on March 5, 2020. (Photo by Kenzo TRIBOUILLARD / AFP) (Photo by KENZO TRIBOUILLARD/AFP via Getty Images)
PHOTO: KENZO TRIBOUILLARD/AFP/Getty Images
Now playing
01:24
Greta Thunberg urges public to listen to the experts (2020)
(CNN) —  

President Donald Trump said he would not have allowed the CIA to recruit the half-brother of North Korean leader Kim Jong Un “under my auspice.”

Trump wouldn’t confirm or deny reports that Kim Jong Nam had been working with the CIA prior to being killed in Malaysia in February 2017, saying that he didn’t know anything about it.

“I know this: that the relationship is such that that wouldn’t happen under my auspices, but I don’t know about that. Nobody knows,” he said.

The one-time heir apparent had become the black sheep of the Kim family before he was killed, after two women smeared nerve agent on his face in Kuala Lumpur International Airport in February 2017. Lawyers for both women, one Indonesian and the other Vietnamese, argued that their clients hadn’t known what they were doing, believing they were taking part in a prank reality TV show.

In an article Monday, the Wall Street Journal claimed that the elder Kim brother had been a source for the CIA and had met with agency operatives several times.

The CIA operative claims are also described in a book about Kim Jong Un by Washington Post reporter Anna Fifield published on Tuesday. “The Great Successor” details meetings between Kim Jong Nam and his handlers in the two countries. The CIA has declined to comment to CNN. Trump took office just a few weeks before Kim Jong Nam’s death and repeatedly said on Tuesday he didn’t know whether the reports are true.

Beautiful letter

It comes as negotiations between US and the North Korean governments have stalled after a breakdown in talks at the Hanoi summit between Trump and Kim Jong Un.

Trump said Tuesday that Kim had so far “kept his word” on nuclear and missile testing, even though no new talks between the US and North Korea are currently planned.

“I just received a beautiful letter from Kim Jong Un and I think the relationship is very well, but I appreciated the letter,” Trump said Tuesday.

But just hours earlier, at an event in Washington, national security adviser John Bolton told the Wall Street Journal that Kim wasn’t complying with the terms agreed at the Singapore summit.

“What they’ve said was that they’re not going to test ballistic missiles, intercontinental range ballistic missiles, or have nuclear tests. That’s continued,” Bolton said.

“They’re doing a lot of other things that still indicate that they have not made a strategic decision to give up the pursuit of deliverable weapons, which is why we continue the maximum pressure campaign.”

CNN’s Joshua Berlinger contributed to this article.