picture of the American Drone shot down by Iran from IRIB
IRIB
picture of the American Drone shot down by Iran from IRIB
Now playing
02:41
Boiling point: How the US-Iran relationship got here
screengrab hong kong oscars
IMDB / Field of Vision
screengrab hong kong oscars
Now playing
02:49
Hong Kong won't air Oscars for the first time since 1968
A split of Alexey Navalny and Vladimir Milov, one of his advisers.
CNN/Getty Images
A split of Alexey Navalny and Vladimir Milov, one of his advisers.
Now playing
02:50
'Absolutely disastrous': Navalny adviser on Navalny's medical test results
reality check john avlon
reality check john avlon
Now playing
02:59
Avlon: Will GOP still parrot Putin's disinformation post-Trump?
Reuters
Now playing
01:20
Firefighters battle flames in South African national park
Russian opposition leader Alexei Navalny delivers a speech during a demonstration in Moscow on September 29, 2019. - Thousands gathered in Moscow for a demonstration demanding the release of the opposition protesters prosecuted in recent months. Police estimated a turnout of 20,000 people at the Sakharov Avenue in central Moscow about half an hour after the start of the protest, which was authorised. The demonstrators chanted "let them go" and brandished placards demanding a halt to "repressions" of opposition protesters. (Photo by Yuri KADOBNOV / AFP) (Photo by YURI KADOBNOV/AFP via Getty Images)
YURI KADOBNOV/AFP/Getty Images
Russian opposition leader Alexei Navalny delivers a speech during a demonstration in Moscow on September 29, 2019. - Thousands gathered in Moscow for a demonstration demanding the release of the opposition protesters prosecuted in recent months. Police estimated a turnout of 20,000 people at the Sakharov Avenue in central Moscow about half an hour after the start of the protest, which was authorised. The demonstrators chanted "let them go" and brandished placards demanding a halt to "repressions" of opposition protesters. (Photo by Yuri KADOBNOV / AFP) (Photo by YURI KADOBNOV/AFP via Getty Images)
Now playing
02:09
Alexey Navalny 'close to death,' press secretary says
WINDSOR, ENGLAND - APRIL 17: The Duke of Edinburgh's coffin, covered with His Royal Highness's Personal Standard is carried to the purpose built Land Rover during the funeral of Prince Philip, Duke of Edinburgh at Windsor Castle on April 17, 2021 in Windsor, England. Prince Philip of Greece and Denmark was born 10 June 1921, in Greece. He served in the British Royal Navy and fought in WWII. He married the then Princess Elizabeth on 20 November 1947 and was created Duke of Edinburgh, Earl of Merioneth, and Baron Greenwich by King VI. He served as Prince Consort to Queen Elizabeth II until his death on April 9 2021, months short of his 100th birthday. His funeral takes place today at Windsor Castle with only 30 guests invited due to Coronavirus pandemic restrictions. (Photo by Adrian Dennis/WPA Pool/Getty Images)
Adrian Dennis/WPA Pool/Getty Images
WINDSOR, ENGLAND - APRIL 17: The Duke of Edinburgh's coffin, covered with His Royal Highness's Personal Standard is carried to the purpose built Land Rover during the funeral of Prince Philip, Duke of Edinburgh at Windsor Castle on April 17, 2021 in Windsor, England. Prince Philip of Greece and Denmark was born 10 June 1921, in Greece. He served in the British Royal Navy and fought in WWII. He married the then Princess Elizabeth on 20 November 1947 and was created Duke of Edinburgh, Earl of Merioneth, and Baron Greenwich by King VI. He served as Prince Consort to Queen Elizabeth II until his death on April 9 2021, months short of his 100th birthday. His funeral takes place today at Windsor Castle with only 30 guests invited due to Coronavirus pandemic restrictions. (Photo by Adrian Dennis/WPA Pool/Getty Images)
Now playing
02:29
See memorable moments from Prince Philip's funeral
ITN
Now playing
02:10
Princes Harry and William seen together at Prince Philip's funeral
Getty Images
Now playing
00:55
CNN anchor: We saw a Queen grieving
Getty Images
Now playing
03:00
The end of an era has arrived in Cuba
Cuban prime minister Fidel Castro talking with parents of some of the American prisoners held hostage for food and supplies by the Cuban government after the abortive emigre invasion at the Bay of Pigs, January 1963.
Keystone/Hulton Archive/Getty Images
Cuban prime minister Fidel Castro talking with parents of some of the American prisoners held hostage for food and supplies by the Cuban government after the abortive emigre invasion at the Bay of Pigs, January 1963.
Now playing
05:37
Remembering the Bay of Pigs invasion, 60 years later
Myanmar Bago killing Hancocks pkg intl hnk vpx_00002309.png
Myanmar Bago killing Hancocks pkg intl hnk vpx_00002309.png
Now playing
03:39
Eyewitnesses recount bloody crackdown in Bago, Myanmar
MAY LEWIS via Reuters
Now playing
00:49
Here's why this river turned white
Hong Kong national security education day Lu Stout W&T intl hnk vpx_00013016.png
Hong Kong national security education day Lu Stout W&T intl hnk vpx_00013016.png
Now playing
01:42
Hong Kong police showcase 'Chinese-style goose-stepping'
brazil coronavirus jair bolsonaro rio de janeiro Darlington pkg intl ldn vpx_00003012.png
AFP
brazil coronavirus jair bolsonaro rio de janeiro Darlington pkg intl ldn vpx_00003012.png
Now playing
02:43
Last week, coronavirus killed 3 people every minute in Brazil
WASHINGTON, DC - APRIL 15: U.S. President Joe Biden announces new economic sanctions against the Russia government from the East Room of the White House on April 15, 2021 in Washington, DC. Biden announced sanctions against 32 companies and individuals that are aimed at choking off lending to the Russian government and in response to the 2020 hacking operation that breached American government agencies and some of the nation's largest companies. (Photo by Chip Somodevilla/Getty Images)
Chip Somodevilla/Getty Images
WASHINGTON, DC - APRIL 15: U.S. President Joe Biden announces new economic sanctions against the Russia government from the East Room of the White House on April 15, 2021 in Washington, DC. Biden announced sanctions against 32 companies and individuals that are aimed at choking off lending to the Russian government and in response to the 2020 hacking operation that breached American government agencies and some of the nation's largest companies. (Photo by Chip Somodevilla/Getty Images)
Now playing
06:49
Biden imposes new sanctions on Russia
(CNN) —  

President Donald Trump threatened Iran with “obliteration” on Tuesday, saying that an attack on “anything American will be met with great and overwhelming force.”

“In some areas, overwhelming will mean obliteration. No more John Kerry & Obama!” the President tweeted.

Speaking in the Oval Office later in the day, Trump said he believes Iran still takes his threats seriously after he canceled a planned military strike and told reporters he does not need an “exit strategy” from the increasingly tense situation.

Trump also said his message to Tehran following the recent exchange of hostile words between the US and Iran – including Iranian President Hassan Rouhani saying the White House is suffering from a “mental disability” – was that he wants to negotiate.

“I’ll tell you what the message is: When they’re ready, they have to let us know,” Trump said. “Whatever they want to do, I’m ready.”

“You’re not going to need an exit strategy. I don’t need exit strategies,” he added.

Those comments came hours after Trump had responded to Rouhani’s comments on Twitter, saying, “Iran’s very ignorant and insulting statement, put out today, only shows that they do not understand reality.”

“Their leadership spends all of its money on Terror, and little on anything else. The U.S. has not forgotten Iran’s use of IED’s & EFP’s (bombs), which killed 2000 Americans, and wounded many more,” he added.

Trump’s figures regarding Iranian responsibility for American deaths appeared to be significantly higher than those provided by the State Department and the Pentagon in April, which said that “at least 603 US personnel deaths in Iraq” were the result of attacks by Iran-backed militants between 2003 and 2011.

Rouhani also said that those “in charge of the White House are feeling frustrated” by the state of play in the region, according to the semi-official Tasnim news agency. He added that the US had wrongly expected to “create chaos” in Iran in two to three months, during his speech to senior health officials.

During an unannounced trip to Afghanistan, Secretary of State Mike Pompeo called Rouhani’s comments, “a bit immature and childlike.”

“But know that the United States will remain steadfast,” he added.

Speaking to reporters Sunday, Pompeo said “we’re prepared to negotiate with no preconditions,” adding that he was “confident that at the very moment they are ready to engage with us, we will be able to begin these conversations.”

The secretary of state has previously issued 12 demands for change in Iran before the US will ease its maximum pressure campaign against Iran. The Trump administration has argued that the Joint Comprehensive Plan of Action, the nuclear deal it abandoned in 2018, is inadequate as it doesn’t cover Iran’s ballistic missiles or regional activities.

Yet, tensions between the US and Iran are now at their highest level in years, coming on the back of last week’s downed US drone, but also stretching to 2018 when Trump walked away from the Iranian nuclear deal implemented by his predecessor Barack Obama.

Iran has since threatened to exceed enrichment limits allowed under the nuclear deal and is blamed by the US for attacks on two tankers in the vital Gulf of Oman waterway earlier this month. Iran denied responsibility for the ship attacks.

The situation continued to escalate when Trump threatened airstrikes on Iran last week – calling them off just minutes before they were due to begin.

On Tuesday, his national security adviser, John Bolton, continued the administration’s tough rhetoric.

Bolton referred to Iran as a “radical regime” that supports “violent provocations abroad,” ahead of a trilateral meeting with his Israeli and Russian counterparts in Jerusalem.

But he also added that Trump had “held the door open to real negotiations.”

“All that Iran needs to do is walk through that open door,” said Bolton, known for being one of the administration’s most hawkish advisers on Iran.

Bolton said later Tuesday that Trump called him prior to sending tweets threatening Iran and said the President asked him to “get the message out” that Iran, in Trump’s words, will face “great and overwhelming force” if it attacks “anything American.”

That message, however, has not been well received by at least one US ally in the region – Iraq, whose President Barham Salih told CNN that under no circumstances will the US be allowed to launch attacks on neighboring Iran from its bases in his country.

“We do not want our territory to be a staging post for any hostile action against any of our neighbors, including Iran,” Salih said in an interview with CNN’s Christiane Amanpour in London on Tuesday.

“This is definitely not part of the agreement between the Iraqi government and the United States.”

CNN’s Ryan Browne, Maegan Vasquez, Shirzad Bozorgmehr, Frederik Pleitgen and Sheena McKenzie contributed reporting