Ireland has a curious form of government where the President is the head of state elected by the people and primarily a figurehead who in turn appoints the Prime Minister (technically called the Taoiseach), the head of government and the most powerful official in the country. (In comparison, in Britain the monarch is the head of state while the Prime Minister is the head of government, and in the United States the President is concurrently both the head of state and head of government.)
Ireland has a long history of inclusiveness, welcoming people who are not ethnically Irish to be a part of the country. Arguably the most famous politician in modern Irish history was Éamon de Valera, the American-born Jewish son of an Irish woman and a Spanish father.
Varadkar is known not to suffer fools gladly. I can't wait to see the fireworks when he confronts Donald Trump at the next G20 Summit.