dublin irish government verge collapse thursday party whose vote prime minister leo varadkar depend pass legislation appear set break term confidence supply deal opposition fianna fail party say would put motion confidence deputy prime minister frances fitzgerald tuesday move would breach deal agree support varadkar fine gael government key vote three years fianna fail indicate might withdraw motion fitzgerald resign foreign minister simon coveney tell state broadcaster rte fitzgerald would resign crisis come weeks ahead european union summit irish government effective veto whether britain talk leave bloc progress determine eu concern future irish border meet irish government verge collapse spat deputy pm