Ireland's main opposition party on Friday filed a motion of no-confidence in the deputy prime minister, a move that brings the government to the verge of collapse three weeks before a crucial European Union summit on Brexit. The Fianna Fail party is calling for the resignation of Prime Minister Leo Varadkar's deputy, Frances Fitzgerald, over her involvement in a long-running police scandal. Opposition leaders accuse a previous government, in which Fitzgerald was justice minister, of failing to defend a whistleblower exposing corruption in Ireland's police force. Once seen as Ireland's Justin Trudeau, progressive credentials of Leo Varadkar now in doubt Varadkar's Fine Gael party is standing by Fitzgerald, but his minority government relies on support from Fianna Fail to govern. If it loses a confidence vote, Ireland faces a snap election. Ireland's Parliament is due to debate the no-confidence motion on Tuesday, unless Fitzgerald resigns. But Irish Prime Minister Leo Varadkar said later Friday he would not seek her resignation. "What that would mean is me throwing a good woman under the bus to save myself and my own government, and that would be the wrong thing to do," Varadkar told the national broadcaster RTE. "I think if we don't resolve matters by Tuesday, then there will be a motion of no confidence in the Tanaiste [deputy prime minister] and, if the opposition come together to remove the Tanaiste, then we will be into an election at that point," added Varadkar, who in June was sworn in. Varadkar spoke briefly with Fianna Fail Leader Michael Martin on Friday and the pair are due to speak again on Saturday. Frances Fitzgerald is seen in a Dec. 2015 file photo speaking with a German official while in Brussels. The opposition believes Fitzgerald should resign for her actions in a whistleblower scandal. (Laurent Dubrule/EPA) EU leaders will decide at a Dec. 14-15 summit whether there has been enough progress in Brexit talks to start discussions over Britain's future relations with the bloc. Ireland says the EU will block those talks if Britain does not spell out how it can keep the Ireland-Northern Ireland border free of customs posts and other barriers