PresidentJoe Bidenexpressed concern forKing Charlesin the wake of Buckingham Palace’sannouncement on Mondaythat the King, 75, has cancer.

“I’m concerned about him,” Biden, 81, told reporters shortly after the announcement was made. “Just heard his diagnosis.”

Biden noted that he had not yet spoken to the British monarch about the diagnosis, adding, “But I’ll be talking to him, God willing.”

King Charles III and The President of the United States, Joe Biden.Chris Jackson - WPA Pool/Getty Images

King Charles III and The President of the United States, Joe Biden walk together in the Quadrangle at Windsor Castle

Chris Jackson - WPA Pool/Getty Images

After undergoing a procedure totreat an enlarged prostatelast month, Buckingham Palace revealed the King’s diagnosis on Monday, saying: “During The King’s recent hospital procedure for benign prostate enlargement, a separate issue of concern was noted. Subsequent diagnostic tests have identified a form of cancer.”

President Joe Biden and King Charles III at Windsor Castle on July 10, 2023.Chris Jackson/WPA Pool/Shutterstock

The President of the United States, Joe Biden and King Charles III in the Green Drawing room to meet with participants of the Climate Finance Mobilisation forum at Windsor Castle

Chris Jackson/WPA Pool/Shutterstock

King Charles III and Queen Camilla at the balcony of Buckingham Palace following their coronation on May 6, 2023.P van Katwijk/Getty

King Charles III and Queen Camilla at the balcony of Buckingham Palace following the Coronation of King Charles III and Queen Camilla on May 6, 2023 in London, England.

P van Katwijk/Getty

PEOPLE understands King Charles told his sons,Prince WilliamandPrince Harry, about the diagnosis himself. A source says William, 41, is in regular contact with his father while Harry, 39, who relocated to California with his wife,Meghan Markle, in 2020, is expected to travel to the U.K. in the coming days

The King also personally informed his siblings,Princess Anne,Prince AndrewandPrince Edward, before the news was made public.

Last July, the King welcomed Biden to Windsor Castle, a moment that marked Charles’ first formal meeting with a U.S. president during his royal reign.

Though the trip did not mark a full-blown state visit, it allowed the two heads of state to discuss a matter close to both their hearts — climate change, as part of the Climate Finance Mobilisation Forum.

Joe Biden, King Charles.CHRIS JACKSON/POOL/AFP via Getty

US President Joe Biden places his hand on the back of Britain’s King Charles III as they walk in the Quadrangle

CHRIS JACKSON/POOL/AFP via Getty

Biden and King Charles have met a number of times in recent years, from a 2015 meeting in the Oval Office of the White House with then-PresidentBarack ObamaandQueen Camilla(who was then known as the Duchess of Cornwall) to theCOP26 United Nations Climate Change Conferencein Glasgow, Scotland in 2021.

Earlier that year, Biden and his wife met withQueen Elizabethat Windsor Castle in June just a few months after he took office. Biden would be the 13th and final American president Queen Elizabeth met during her historic reign.

The president and first lady represented the U.S. at her state funeral in September 2022.

source: people.com