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LONDON, March 20 (Xinhua) -- The Taoiseach (Irish prime minister) of the Republic of Ireland Leo Varadkar announced Wednesday that he will resign as party leader immediately and as Taoiseach as soon as his Fine Gael successor is selected. "One part of leadership is knowing when the time has come to pass on the baton to somebody else, and then having the courage to do it," Varadkar said in a statement. "Th