The former commander-at-large of the US Border Patrol has revealed how to solve Britain's migrant crisis in a major plea to Sir Keir Starmer.
Gregory Bovino, speaking to GB News in Texas, said the migrant crisis was an issue shared between the US and "our brothers and sisters there across the pond".
His first piece of advice to Labour was to not "take a step backwards" - and he told the Government to be unapologetic for the "legal, ethical, and lawful mission that is designed to help the taxpayer - the citizens, the good citizens of Great Britain".
"I'm saying go hard to deport as many illegal aliens as you can," he added.
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Mr Bovino led Immigration and Customs Enforcement (Ice) missions in Los Angeles and Minnesota under the White House in 2025, but left the role in January 2026.
But his tenure was rocked by vicious protests in cities like Minnesota.
He added that while the public should be allowed to peacefully protest, the Government should not put up with "lawlessness" that disrupts border patrol.
Turning his attention back to America, Mr Bovino took a swipe at his former boss - and revealed he felt the White House was not deporting enough illegal migrants.
Gregory Bovino spoke to GB News at CPAC in Texas
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Asked if the number of people being deported was enough, he told The People's Channel: "No, absolutely not. They all need to go.
"So there's tens of millions more. Probably a hundred million."
He also warned that if both the Britain and the US do nothing about migration enforcement, it risks changing the "character of the nation".
The former Department of Homeland Security (DHS) official said: "If you want the very character of your nation changed forever, then by doing nothing about illegal immigration, it's going to change.
"They all need to go - or if they don't, you're going to have a you're going to have a tough time there in Great Britain," he warned.
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Gregory Bovino led Ice operations in Minnesota, Los Angeles, and Chicago
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Mr Bovino warned of 'tough times' ahead in Britain if it did not deport its illegal migrants
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Mr Bovino has previously admitted he regrets not being able to deport more migrants during his time in the White House in an interview with The New York Times.
The White House said it deported a total of nearly three million illegal migrants since Donald Trump's administration began cracking down.
This included a 2.2 million self-deportations, alongside 675,000 other deportations, according to DHS data.
In December, the White House said it had arrested 10,000 illegal migrants in operations in California, and over 4,000 "criminal illegal aliens" in Operation Metro Surge in Minneapolis, Minnesota - both operations led by Mr Bovino.
Ice operations were frequently protested under Gregory Bovino's tenure, including his operations in Los Angeles, pictured here
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Operation Metro Surge resulted in the deaths of Alex Pretti and Renee Good, which led to increased scrutiny of Ice.
Earlier this week, Markwayne Mullin was confirmed to replace Kristi Noem as head of the DHS and said he was hoping to lead the department in a lower-profile way.
Mr Mullin said: "My goal in six months is that we’re not in the lead story every single day."
Mr Bovino, who announced he was retiring this week, spoke to GB News at the Conservative Political Action Conference, one of the largest annual conservative events in the US.
Guests this year included Republican midterm electoral candidates such as Michael Whatley, running in North Carolina, and Ken Paxton, who is currently in a run-off for a Senate seat in Texas.
Former Prime Minister Liz Truss also spoke at the event, warning "there is still a deep state here in America" and urged conservatives to "remove them".