Donald Trump has threatened to “drop” captured Isis fighters on the UK border if the government does not start repatriating them from Syrian camps.

Speaking at a press conference where he announced the death of Isis leader Abu Bakr al-Baghdadi, the US president called European nations a “tremendous disappointment”.

After thanking Russia, Turkey, Syria and Iraq for assistance in the operation, Mr Trump said he had personally pressured EU countries to take back Isis members.

“They came from France, they came from Germany, they came from the UK. They came from a lot of countries,” he added.

“And I actually said to them, if you don’t take them, I’m going to drop them right on your border and you can have fun capturing them again.”

Timeline of the Isis caliphate Show all 19 1 /19 Timeline of the Isis caliphate Timeline of the Isis caliphate ISIS began as a group by the merging of extremist organisations ISI and al-Nusra in 2013. Following clashes, Syrian rebels captured the ISIS headquarters in Aleppo in January 2014 (pictured) AFP/Getty Timeline of the Isis caliphate Abu Bakr Al-Baghdadi declared the creation of a caliphate in Mosul on 27 June 2014 Timeline of the Isis caliphate Isis conquered the Kurdish towns of Sinjar and Zumar in August 2014, forcing thousands of civilians to flee their homes. Pictured are a group of Yazidi Kurds who have fled Rex Timeline of the Isis caliphate On September 2 2014 Isis released a video depicting the beheading of US journalist Steven Sotloff. On September 13 they released another video showing the execution of British aid worker David Haines Timeline of the Isis caliphate The US launched its first airstrikes against Isis in Syria on 23 September 2014. Here Lt Gen William C Mayville Jnr speaks about the bombing campaign in the wake of the first strikes Getty Timeline of the Isis caliphate Isis militants sit atop a hill planted with their flag in the Syrian town of Kobani on 6 October 2014. They had been advancing on Kobani since mid-September and by now was in control of the city’s entrance and exit points AFP/Getty Timeline of the Isis caliphate Residents of the border village of Alizar keep guard day and night as they wait in fear of mortar fire from Isis who have occupied the nearby city of Kobani Getty Timeline of the Isis caliphate Smoke rises following a US airstrike on Kobani, 28 October 2014 AFP/Getty Timeline of the Isis caliphate YPG fighters raise a flag as they reclaim Kobani on 26 January 2015 VOA Timeline of the Isis caliphate Isis seized the ancient Syrian city of Palmyra on 20 May 2015. This image show the city from above days after its capture by Isis Getty Timeline of the Isis caliphate Kurdish forces are stationed on a hill above the town of Sinjar as smoke rises following US airstrikes on 12 November 2015 AFP/Getty Timeline of the Isis caliphate Kurdish forces enter Sinjar after seizing it from Isis control on 13 November 2015 AFP/Getty Timeline of the Isis caliphate Iraqi government forces make the victory sign as they retake the city of Fallujah from ISIS on 26 June 2016 Getty Timeline of the Isis caliphate Iraqi forces battle with Isis for the city of Mosul on 30 June 2017 AFP/Getty Timeline of the Isis caliphate Members of the Iraqi federal police raise flags in Mosul on 8 July 2017. On the following day, Iraqi prime minister Haider Al Abadi declares victory over Isis in Mosul Getty Timeline of the Isis caliphate Members of Syrian Democratic Forces celebrate in Al-Naim square after taking back the city of Raqqa from Isis. US-backed Syrian forces declare victory over Isis in Raqqa on 20 October 2017 after a four-month long campaign Getty Timeline of the Isis caliphate Female fighters of the Syrian Democratic Forces celebrate in Al-Naim Square after taking back the city of Raqqa from Isis. US-backed Syrian forces declare victory over Isis in Raqqa on 20 October 2017 after a four-month long campaign AFP/Getty Timeline of the Isis caliphate Trucks full of women and children arrive from the last Isis-held areas in Deir ez-Zor, Syria in January 2019 They were among the last civilians to be living in the ISIS caliphate, by this time reduced to just two small villages in Syria’s Deir ez-Zor Richard Hall/The Independent Timeline of the Isis caliphate Zikia Ibrahim, 28, with her two-year-old son and 8-month-old daughter, after fleeing the Isis caliphate, on Saturday 26 January 2019 Richard Hall/The Independent

Mr Trump suggested that if detainees escape Kurdish-controlled camps, the US will not “capture people that want to go back to Germany, France, UK and other parts of Europe”.

“They could walk back – they can’t walk to our country. We have lots of water in between our country and them,” he added.

Mr Trump has made similar threats several times in the past, saying earlier this month that he was unconcerned over the potential escape of Isis fighters because “they’re going to be escaping to Europe”.

In August, the US president claimed he would “release [thousands of Isis fighters] to Europe” if they were not repatriated, but the threat has never materialised.

The US does not directly control the prisons and camps where foreign fighters, female Isis members and their children are being held by Kurdish forces.

Numerous escapes have been reported since Mr Trump ordered the US military to withdraw from Syria earlier this month, sparking a Turkish-backed incursion into the areas where Isis members were detained.

Divisions between the captives have also sparked assassinations and unrest inside the camps, amid warnings of a potential Isis insurgence.

In the last audio message released before his death, Baghdadi directly called for his followers to free detained Isis members and their families from camps.

Dozens of jihadis from the UK and at least 60 British children who fled Isis-held areas as the group’s “caliphate” fell are thought to be held in northern Syria, including Shamima Begum and Jack Letts.

Two members of the British Isis terror cell known as “The Beatles” have already been transferred to US custody for trial over the torture and execution of hostages including James Foley and David Haines.

‘He died whimpering and crying’: Trump announces Isis leader Abu Bakr al-Baghdadi killed in US raid in Syria

Kurdish commanders in the region have told The Independent they cannot secure Isis prisons and camps if fighting with Turkish forces continues in spite of a Russia-brokered ceasefire.

“We are still maintaining control but if the Turkish threat and attacks continue, we do not know for how long we will be able to keep these prisons secured,” said Syrian Defence Forces commander Mervan Qamishli.

“We need help stopping the conflict so that our forces can return to protecting and managing the prisons.”

American officials say that at least 100 Isis fighters have already escaped in the two weeks since Turkey launched its incursion against Kurdish fighters, which were allied to the US-led coalition but considered terrorists by Ankara.

Kurdish officials estimate that an additional 800 Isis family members may have also fled from Ain Issa camp, which was home to more than 100,000 displaced people.

There are also fears over the security of the al-Hol and Roj camps, which are each home to significant populations of foreign Isis suspects.

The British government has refused to repatriate captives for trial and dramatically increased its use of controversial citizenship deprivation powers to prevent any return to the UK.

Reports suggest it may be preparing to transfer children of British jihadis who have been trapped in the warzone, although it is unclear whether the policy would only apply to unaccompanied children and orphans, or those still with their parents.

Several MPs have called for the government to repatriate UK extremists, which Kurdish officials called Britain’s “moral and legal duty”.

In August, former defence minister Tobias Ellwood warned that the detention of thousands of jihadis and their families in Syria was creating conditions for an Isis resurgence and global terror attacks.

The UK government may be preparing to transfer children of British jihadis trapped in the warzone (AFP via Getty) (AFP)

“We’ll see Daesh 2.0,” he told The Independent. “We’ll see a repeat of al-Qaeda regrouping and becoming a very real threat, and that threat won’t just pose itself in the Middle East, but also to Britain.”

The government welcomed news of Baghdadi’s death on Saturday but experts said that Isis’s bureaucracy and increased focus on international factions outside Iraq and Syria would ensure its survival.

Before becoming the “caliph” of the self-declared Islamic State during a 2014 advance, where it waged a campaign of genocide, mass rape and forced against the Yazidi minority, Baghdadi had been captured by US forces.

He was detained in the Iraqi city of Fallujah in 2004 alongside other extremists who would become senior Isis figures.

He became the leader of al-Qaeda in Iraq in 2010 – a year before the death of Osama bin Laden – and waged a bloody terrorist campaign in the country before expanding into Syria and declaring the formation of Isis following infighting in 2014.

Mr Trump said Baghdadi killed himself and three children by detonating a suicide bomb during a US special forces raid on his Syrian hideout on Saturday.

The Independent understands that the British military was not involved in the operation.

Boris Johnson called Baghdadi’s death “an important moment in our fight against terror” but added: “The battle against the evil of Daesh is not yet over.