King Charles sent Donald Trump a letter after the shooting incident in Philadelphia on Saturday.

The British monarch reached out to the former U.S. president after he learned that Trump was targeted in an assassination attempt during his rally in Butler, Pennsylvania. He wrote a private later on Sunday, and it was delivered by the United Kingdom's embassy in Washington, Fox News reported.

However, the content of the letter remains unknown. The outlet noted that the Palace declined to comment when asked about it.

The British monarch and ex-POTUS met several times over the years. They first met in 2005 when His Majesty and Queen Camilla visited the United States. They met again at President George H.W. Bush's funeral in 2018.

Melania, Donald Trump, King Charles and Camilla
Britain's Prince Charles, Prince of Wales (2nd R) and Britain's Camilla, Duchess of Cornwall (R), US President Donald Trump (2nd L) and US First Lady Melania Trump (L) prepare to pose for a photograph at Clarence House in central London on December 3, 2019, ahead of the NATO alliance summit. NICHOLAS KAMM/POOL/AFP via Getty Images

In 2019, the two leaders reunited when Trump flew to the United Kingdom for a three-day visit with his wife, Melania Trump. The late Queen hosted a state banquet for the former first couple at Buckingham Palace, Business Insider reported. Trump and Melania also posed for photos with Queen Elizabeth, then-Prince Charles and Camilla.

King Charles' youngest son, Prince Harry, is rumored to be at odds with Trump. The Duke of Sussex admitted to using psychedelic drugs, including cannabis and cocaine, in his memoir "Spare." Following his admission, many wanted to know how his drug history would affect his U.S. visa.

Joe Biden's administration was accused of "protecting Harry" by keeping his visa application confidential. However, Trump said he wouldn't do the same if reelected.

Prince Charles, Queen Elizabeth and Donald Trump
Queen Elizabeth II, accompanied by Prince Charles, Prince of Wales, President of the United States, Donald Trump pose for a formal photograph with leaders of the other Allied Nations ahead of the National Commemorative Event commemorating the 75th anniversary of the D-Day invasion on June 5, 2019 in Portsmouth, England. Jack Hill - WPA Pool/Getty Images

"No," Trump said when asked if Prince Harry would get special privileges.

"We'll have to see if they know something about the drugs, and if he lied, they'll have to take appropriate action," he added.

Trump also shared the same sentiment when asked about the issue at the CPAC. According to him, he would not protect Prince Harry after what he did to his family.

"I wouldn't protect him. He betrayed the Queen. That's unforgivable. He would be on his own if it was down to me," Trump said.

Prince Charles and Donald Trump
Prince Charles, Prince of Wales and US President Donald Trump attend a function during the D-day 75 Commemorations on June 05, 2019 in Portsmouth, England. Jeff J Mitchell - WPA Pool /Getty Images

The businessman-turned-politician also said that the royal family has been "too gracious" to the Duke of Sussex after "what he has done."

Michael Cole, a former BBC royal correspondent, claimed Prince Harry could be kicked out of America if he did not tell the truth about his drug history in his visa application. If this happens, the Sussexes might move to Canada.

"With Donald Trump, you're either in or out, you're either friend or foe," Cole said, seemingly warning the Duke and Duchess of Sussex. "If he regards you as a foe, he will do his best to act against you, there's no doubt about it. It's as clear as night from day. It's very serious matter."

Prince Harry and Meghan Markle
Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex are seen during the 2024 ESPY Awards at Dolby Theatre on July 11, 2024 in Hollywood, California. Frazer Harrison/Getty Images
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King Charles, Donald trump, Prince Harry