Biden Picks Mass. House Majority Leader Claire Cronin To Be Next Ambassador To Ireland President Joe Biden speaks during an event in the State Dining room of the White House in Washington, Wednesday, June 23, 2021. The White House announced Wednesday that he will nominate Mass. Rep. Claire Cronin to be the next U.S. ambassador to Ireland. Susan Walsh/AP June 23, 2021 House Majority Leader Claire Cronin will be nominated by President Joe Biden to become the next ambassador to Ireland, the White House announced on Wednesday, confirming its plans to tap one of the president's leading surrogates in a state Biden won during the 2020 campaign for a plum overseas posting.