Los Angeles - Barack Obama sent a message of condolence to Joan Rivers' daughter.
The US president wrote a hand-written message to Melissa Rivers following the passing of the 81-year-old star - who died earlier this month after suffering a cardiac arrest while undergoing throat surgery - in which he praised her thought-provoking humour.
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Melissa recently spoke out to thank fans for their messages of support following her mother's death
Speaking on a Fashion Police: Celebrating Joan
special which airs in the US on Friday, Melissa said: "She affected so many people, and people you would never expect to have humour."