The President is among world leaders who've sent messages to Britain's King Charles, whose been diagnosed with cancer.
Michael D. Higgins sent best wishes on behalf of the people of Ireland after it was revealed the 75 year old was stepping back from public duties while undergoing treatment.
In a statement Buckingham Palace said during his recent hospital procedure for benign prostate enlargement - a separate issue of concern was noted.
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Sky's Royal Commentator, Alastair Bruce said it will be a difficult time for the royal couple.
