US President Donald Trump (R) and Russia's President Vladimir Putin chat as they walk together to take part in the "family photo" during the Asia-Pacific Economic Cooperation (APEC) leaders' summit in the central Vietnamese city of Danang on November 11, 2017.
World leaders and senior business figures are gathering in the Vietnamese city of Danang this week for the annual 21-member APEC summit. / AFP PHOTO / POOL / JORGE SILVA        (Photo credit should read JORGE SILVA/AFP/Getty Images)
JORGE SILVA/AFP/AFP/Getty Images
US President Donald Trump (R) and Russia's President Vladimir Putin chat as they walk together to take part in the "family photo" during the Asia-Pacific Economic Cooperation (APEC) leaders' summit in the central Vietnamese city of Danang on November 11, 2017. World leaders and senior business figures are gathering in the Vietnamese city of Danang this week for the annual 21-member APEC summit. / AFP PHOTO / POOL / JORGE SILVA (Photo credit should read JORGE SILVA/AFP/Getty Images)
Now playing
03:53
Gift to Putin? Trump considered quitting NATO
screengrab japan fukushima daiichi
IAEA
screengrab japan fukushima daiichi
Now playing
02:31
Japan plans to release treated Fukushima water into sea
SUEZ, EGYPT - MARCH 29: The container ship 'Ever Given' is refloated, unblocking the Suez Canal on March 29, 2021 in Suez, Egypt. This morning the container ship came partly unstuck from the shoreline, where it ran aground in the canal last Tuesday, and later resumed its course shortly after 3pm local time. The Suez Canal is one of the world's busiest shipping lanes and the blockage had created a backlog of vessels at either end, raising concerns over the impact on global shipping and supply chains. (Photo by Mahmoud Khaled/Getty Images)
Mahmoud Khaled/Getty Images
SUEZ, EGYPT - MARCH 29: The container ship 'Ever Given' is refloated, unblocking the Suez Canal on March 29, 2021 in Suez, Egypt. This morning the container ship came partly unstuck from the shoreline, where it ran aground in the canal last Tuesday, and later resumed its course shortly after 3pm local time. The Suez Canal is one of the world's busiest shipping lanes and the blockage had created a backlog of vessels at either end, raising concerns over the impact on global shipping and supply chains. (Photo by Mahmoud Khaled/Getty Images)
Now playing
00:57
Egypt seizes Ever Given ship, asks for $900M in compensation
Taiwan has been the chief source of tension between Washington and Beijing for decades and is widely seen as the most likely trigger for a potentially catastrophic US-China war. The worry about Taiwan comes as China wields new strength from years of military buildup. CNN's David Culver reports.
PLA Air Force/Weibo
Taiwan has been the chief source of tension between Washington and Beijing for decades and is widely seen as the most likely trigger for a potentially catastrophic US-China war. The worry about Taiwan comes as China wields new strength from years of military buildup. CNN's David Culver reports.
Now playing
04:04
Dramatic videos show Chinese naval exercises amid rising tensions over Taiwan
CNN
Now playing
05:40
Unprecedented footage shows front line of Ukrainian conflict with Russia
5995404 02.09.2019 Iranian Foreign Minister Mohammad Javad Zarif attends a news conference following his meeting with his Russian counterpart Minister Sergei Lavrov, in Moscow, Russia. Iliya Pitalev / Sputnik  via AP
Iliya Pitalev/SPTNK/Sputnik via AP
5995404 02.09.2019 Iranian Foreign Minister Mohammad Javad Zarif attends a news conference following his meeting with his Russian counterpart Minister Sergei Lavrov, in Moscow, Russia. Iliya Pitalev / Sputnik via AP
Now playing
04:09
Iran accuses Israel of sabotaging nuclear site, vows revenge
Ash rises into the air as La Soufriere volcano erupts on the eastern Caribbean island of St. Vincent, seen from Chateaubelair, Friday, April 9, 2021. (AP Photo/Orvil Samuel)
Orvil Samuel/AP
Ash rises into the air as La Soufriere volcano erupts on the eastern Caribbean island of St. Vincent, seen from Chateaubelair, Friday, April 9, 2021. (AP Photo/Orvil Samuel)
Now playing
01:08
See the looming clouds of ash over La Soufrière volcano
screengrab Vanuatu villagers mourn philip
Reuters
screengrab Vanuatu villagers mourn philip
Now playing
02:03
Remote tribe worships Prince Philip as god, mourns his death
ITN
Now playing
01:15
Prince Charles speaks following Prince Philip's death
LONDON, UNITED KINGDOM - APRIL 10: The Honourable Artillery Company fire a gun salute at The Tower of London on April 10, 2021 in London, United Kingdom.  The Death Gun Salute will be fired at 1200 marking the death of His Royal Highness, The Prince Philip, Duke of Edinburgh. Across the country and the globe saluting batteries will fire 41 rounds, 1 round at the start of each minute, for 40 minutes. Gun salutes are customarily fired, both on land and at sea, as a sign of respect or welcome. The Chief of the Defence Staff, General Sir Nicholas Carter, said "His Royal Highness has been a great friend, inspiration and role model for the Armed Forces and he will be sorely missed." (Photo by Chris Jackson/Getty Images)
Chris Jackson/Getty Images
LONDON, UNITED KINGDOM - APRIL 10: The Honourable Artillery Company fire a gun salute at The Tower of London on April 10, 2021 in London, United Kingdom. The Death Gun Salute will be fired at 1200 marking the death of His Royal Highness, The Prince Philip, Duke of Edinburgh. Across the country and the globe saluting batteries will fire 41 rounds, 1 round at the start of each minute, for 40 minutes. Gun salutes are customarily fired, both on land and at sea, as a sign of respect or welcome. The Chief of the Defence Staff, General Sir Nicholas Carter, said "His Royal Highness has been a great friend, inspiration and role model for the Armed Forces and he will be sorely missed." (Photo by Chris Jackson/Getty Images)
Now playing
02:03
Prince Philip tributes pour in from around the world
CNN Weather
Now playing
01:35
Powerful Tropical Cyclone Seroja takes aim at Western Australia
People view flowers left in front of the gate at Buckingham Palace in London, after the announcement of the death of Britain's Prince Philip, Friday, April 9, 2021. Buckingham Palace officials say Prince Philip, the husband of Queen Elizabeth II, has died. He was 99. Philip spent a month in hospital earlier this year before being released on March 16 to return to Windsor Castle.
Matt Dunham/AP
People view flowers left in front of the gate at Buckingham Palace in London, after the announcement of the death of Britain's Prince Philip, Friday, April 9, 2021. Buckingham Palace officials say Prince Philip, the husband of Queen Elizabeth II, has died. He was 99. Philip spent a month in hospital earlier this year before being released on March 16 to return to Windsor Castle.
Now playing
01:54
Tributes to Prince Philip pour in from around the world
Britain's Prince Philip, Duke of Edinburgh, in his role as Captain General, Royal Marines, attends a Parade to mark the finale of the 1664 Global Challenge on the Buckingham Palace Forecourt in central London on August 2, 2017.  
After a lifetime of public service by the side of his wife Queen Elizabeth II, Prince Philip finally retires on August 2, 2017,at the age of 96. The Duke of Edinburgh attended a parade of Royal Marines at Buckingham Palace, the last of 22,219 solo public engagements since she ascended to the throne in 1952.
 / AFP PHOTO / POOL / HANNAH MCKAY        (Photo credit should read HANNAH MCKAY/AFP/Getty Images)
HANNAH MCKAY/AFP/Getty Images
Britain's Prince Philip, Duke of Edinburgh, in his role as Captain General, Royal Marines, attends a Parade to mark the finale of the 1664 Global Challenge on the Buckingham Palace Forecourt in central London on August 2, 2017. After a lifetime of public service by the side of his wife Queen Elizabeth II, Prince Philip finally retires on August 2, 2017,at the age of 96. The Duke of Edinburgh attended a parade of Royal Marines at Buckingham Palace, the last of 22,219 solo public engagements since she ascended to the throne in 1952. / AFP PHOTO / POOL / HANNAH MCKAY (Photo credit should read HANNAH MCKAY/AFP/Getty Images)
Now playing
01:39
The life of Prince Philip, Duke of Edinburgh
screengrab myanmar ambassador to UK
CNN
screengrab myanmar ambassador to UK
Now playing
01:02
Video shows Myanmar's ambassador 'locked out' of embassy
King Abdullah II of Jordan and his half brother, former crown prince Hamzah bin Al Hussein
AFP/Getty Images
King Abdullah II of Jordan and his half brother, former crown prince Hamzah bin Al Hussein
Now playing
02:39
Jordan's King breaks silence about family fallout
CNN
Now playing
06:13
Inside Iraq's crippling crystal meth crisis
(CNN) —  

In 2018, President Donald Trump privately raised the threat multiple times of withdrawing the United States from NATO, The New York Times reported.

When the President first floated the possibility of the US leaving NATO, senior administration officials were unsure if he was serious, the newspaper reported. Since then, Trump – who has questioned if the longtime alliance is still relevant and has publicly chastised allies over defense spending – has expressed his desire to leave the alliance several times, senior administration officials told the Times.

Last July, around the time of a contentious NATO summit meeting, Trump told his national security officials he didn’t see the point of NATO and thought the alliance was a drain on the US, the Times said.

The Times reported that Trump’s repeated desire to withdraw from NATO is raising new concerns among national security officials amid a Washington Post report that Trump concealed details of his meetings with Russian President Vladimir Putin and a Times report that the FBI opened a counterintelligence investigation into why Trump was acting in ways that seemed to benefit Russia.

A senior official with a NATO partner country told CNN on Tuesday that allied officials did “work hard” over the last year to convince Trump to remain committed to the historic alliance.

The concern, the official said, was not so much about Trump completely withdrawing from NATO. The discussions were more centered on making sure Trump would honor NATO’s commitment to a common defense of partner countries as established in Article 5 of NATO’s charter, the official added, as without that commitment, NATO would be crippled. The official described efforts to keep Trump committed to NATO as consistent over the last year.

“We’ve raised it multiple times at all levels,” the official said.

The weakening of NATO has been a longtime goal of Putin’s and a withdrawal of the US from NATO would be ideal for the Russian leader.

White House press secretary Sarah Sanders called the Times story “meaningless” in a comment to CNN on Tuesday.

“This story was meaningless when it was written six months ago and even more so now,” she said. “The President has made clear our Allies must fulfill their commitments and share the burden for a strong defense.”

She also referenced comments the President had made praising NATO during a two-day visit to its headquarters last July, when he called the alliance “very important” and the United States’ commitment to it “very strong.”

In response to a request for comment from the Times, a senior administration official pointed to the same remarks by Trump but declined to comment further.

During a news conference last July capping his appearance at the NATO summit, Trump was asked specifically if he thought he could pull out of NATO without congressional approval amid reports that he told NATO allies in a closed-door meeting that they needed to raise spending or the United States may go its own way.

He replied: “I think I probably can, but that is unnecessary. They have stepped up today like they have never stepped up before.”

As Trump arrived at the NATO summit last year, Congress overwhelmingly approved a motion of support for NATO.

A 2017 Gallup poll showed that 80% of Americans said that the NATO alliance should be maintained. A majority of Americans, 78%, said Trump should defend all of America’s NATO allies if necessary, according to a Quinnipiac University poll from July 2018.

CNN’s Allie Malloy and Caroline Kelly contributed to this report.