Sinn Fein's leader said Ireland needed a general election, not a government rotation of taoiseach, as she led opposition criticism of Leo Varadkar's nomination.Mary Lou McDonald said the coalition could try to delay real change in the country, but said they could not halt it.As polls continue to show Sinn Fein as the most popular party, its party president launched a scathing criticism of the Government during the special Dail sitting to elect Mr Varadkar as taoiseach for a second time.