Britain's Prime Minister David Cameron, left, greets the Irish President Michael D. Higgins outside 10 Downing Street in London, Wednesday April 9, 2014. Higgins is on a state visit to Britain, the ... more 
Britain's Prime Minister David Cameron, left, greets the Irish President Michael D. Higgins outside 10 Downing Street in London, Wednesday April 9, 2014. Higgins is on a state visit to Britain, the first ever by an Irish head of state. (AP Photo/Alastair Grant) less 
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Associated Press | Photo By Alastair Grant
Wed, Apr 9, 2014 8:57 AM EDT