Robert S. Trump, the younger brother of President Donald Trump, dead on Saturday night, Aug. 15, at the age of 71.

President Trump announced the death in a brief statement on Saturday, saying, “It is with a heavy heart I share that my wonderful brother, Robert, peacefully passed away tonight.”

“He was not just my brother, he was my best friend,” the president said.

“He will be greatly missed, but we will meet again. His memory will live on in my heart forever. Robert, I love you. Rest in peace,” President Trump continued.

Robert reportedly died in New York-Presbyterian Hospital in Manhattan, where President Trump visited and spent about an hour at his brother’s bedside on Friday afternoon.

President Trump’s son Eric Trump praised his uncle as “an incredible man—strong, kind, and loyal to the core.” The president’s daughter Ivanka Trump tweeted, “Uncle Robert, we love you. You are in our hearts and prayers, always.”

Presumptive Democratic presidential nominee Joe Biden on Sunday morning sent his condolences to President Trump.

“Mr. President, Jill and I are sad to learn of your younger brother Robert’s passing,” Biden wrote in a tweet. “I know the tremendous pain of losing a loved one—and I know how important family is in moments like these. I hope you know that our prayers are with you all.”

Biden’s running mate, Kamala Harris, also offered her condolences to the Trump family.

“Doug and I join the Biden family in sending our deepest condolences and prayers to the entire Trump family during this difficult time. Losing a loved one is never easy but know that we are thinking of you,” Harris wrote on Twitter.

Robert Trump was the youngest child in the family and very supportive of his brother running for president, according to Breitbart.

President Trump has two other living siblings: Maryanne Trump Barry is a senior judge on the U.S. Court of Appeals for the Third Circuit, and Elizabeth Trump Grau is a retired Chase Manhattan Bank executive. His brother Fred was 43 when he died because of complications related to alcoholism.