The new US ambassador to Ireland, Mr Michael Sullivan, presented his letter of credence to the President, Mrs McAleese, at a ceremony in Aras an Uachtarain yesterday.
The ambassador was accompanied by his wife, Ms Jane Metzler Sullivan, and a number of the US embassy's senior staff.
The Minister for Foreign Affairs, Mr Andrews, and a number of his Department's senior staff also were present.
The new ambassador was escorted to and from Aras an Uachtarain by an escort of honour and was received by a guard of honour.
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Mr Sullivan (58), a former governor of the state of Wyoming, succeeds Ms Jean Kennedy Smith in the post.