Joe Biden, the presumptive Democratic presidential nominee, has offered his condolences to US President Donald Trump after the death of his younger brother Robert.
"Mr. President, Jill and I are sad to learn of your younger brother Robert's passing," Biden wrote in a tweet, referring to his wife.
"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."
Mr Trump's younger brother died on Saturday night at age 71.
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The president visited his brother at a New York City hospital on Friday after White House officials announced that he had fallen ill.
The cause of his death was not immediately released.
Mr Biden, who is currently running against Mr Trump for office, lost his first wife and daughter in a car accident in 1972. His son Beau died of a brain tumour in 2015.
