Tensions are reportedly growing between Boris Johnson and Prince Charles - after the heir to the throne reportedly criticised the government's decision to deport asylum seekers to Rwanda.
But the alleged animosity between the pair has been brewing for some time - with sources acknowledging that the Prime Minister and Prince Charles have had a frosty relationship for some time.
It comes after Charles branded the Government's plans to send migrants to Rwanda "appalling".
The Times reports Charles is understood to be irritated at the Home Office policy as he is getting set to represent his mother the Queen on a trip to the country.
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The Prince and PM will be reunited again for the Commonwealth Heads of Government meeting later this month in Rwanda.
During the trip, the Prince of Wales will host the PM at a reception for all heads of government at a dinner on behalf of the Queen.
Now we've taken a deeper look at their relationship - which hasn't always run smoothly.
Obituary fail
Their relationship was said to be so bad that Boris Johnson reportedly struggled to deliver a suitable tribute to the future king in a eulogy after being asked by the BBC.
In case of his sudden death, the broadcaster enlisted the Prime Minister to pay his respects to Prince Charles and Princess Anne in autumn 2020.
But while he was apparently available to deliver a positive message about Princess Anne, he reportedly struggled with the Prince of Wales.
The Times say the PM told aides before the interview that he did not like Charles and made a series of jokes instead - by paying tribute to his Duchy Organic biscuits.
He joked that Charles was the "king of biscuits" and said he feared that he would "take the recipe to his grave".
Long divide
It has been reported that the growing division between the two men harks back to Mr Johnson’s time as Foreign Secretary.
The PM is said to be very relaxed about punctuality and often keeps people waiting for meetings. Meanwhile, Prince Charles cannot abide lateness.
But Whitehall sources told the Mail that this issue has improved - if only because Boris Johnson now has a rigid timetable thanks to strict security reasons.
Balmoral
It is said that the relationship between the pair also soured when Boris Johnson visited the Queen's private estate of Balmoral.
Any visit is seen as a huge honour - as it gives an insight into how the Royal Family live 'behind the scenes' in a more relaxed setting.
But the visit in 2019, at the end of the Queen's summer break, reportedly didn't go as planned, after Prince Charles invited the PM to visit him at his home after visiting HRH.
According to the Mail, the PM's 'shambolic' demeanour during the meeting led to 'eyebrows being raised' by Prince Charles's loyal staff.
A 'distracted’ Mr Johnson was 'clearly not focused' on the meeting in hand - with courtiers claiming the PM had displayed ‘disrespectful’ behaviour.
One source said: "Let’s just say that the Prime Minister was not focused on the meeting with the Prince of Wales in a way one might expect.
"The Prince of Wales is used to meeting all sorts of people but among the aides there was a feeling definitely that during the Birkhall meeting with Boris Johnson, he wasn’t being afforded the respect you might argue that he deserves as a senior public figure who works very hard for the country. The Prince wasn’t kicking up a fuss about it. It was more the staff who felt sorry on his behalf.
"The next time they met, it was sort of quashed. Things have got better, but they have never been what you might call the best of friends"
Rwanda row
Reports last week claimed that Prince Charles had privately described the policy as “appalling”.
A spokesman for the royal didn't deny his comments - but insisted that the Prince of Wales "remains politically neutral”.
A source reportedly heard Charles, 73, expressing his frustration at the policy, telling the newspaper: "He said he was more than disappointed at the policy.
"He said he thinks the Government’s whole approach is appalling. It was clear he was not impressed with the Government’s direction of travel."
Downing Street tried to play down the row, insisting the PM has "great affection and admiration" for the prince.
But it admitted their relationship "has not had the same opportunity to blossom" as the one the PM has with the Queen who he meets on a weekly basis.
The Daily Mail reported that the royal may have subtly shown opposition to the Rwanda scheme in the same week it was announced.
In a "carefully worded” Easter message on 17 April, he highlighted the “millions of people” who “find themselves displaced, wearied by their journey from troubled places, wounded by the past, fearful of the future – and in need of a welcome, of rest, and of kindness”.
In an interview, LBC radio presenter Nick Ferarri asked the PM whether Prince Charles was wrong to make the alleged comments.
He asked: “Prince Charles says the plan is appalling. The Archbishop of Canterbury says it is against the judgment of God. How come you know better than Prince Charles and the Archbishop of Canterbury, prime minister?”
Dodging the question, he replied: "I do think that it’s the job of government to stop people from breaking the law and to support people who are doing the right thing. That’s what we are doing.”
Mr Johnson’s official spokesman said: “The Prime Minister has nothing but respect and admiration for the Prince of Wales, who’s spoken out on a number of issues, not least the environment.”
