The Sinn Fein Leader has called for a special EU summit on Ireland in September.
After a Brexit meeting in Brussels, Mary Lou McDonald said the British government is engaged in a game of brinkmanship which puts Ireland's all-island economy and agreements at risk.
Meanwhile the new British Foreign Secretary has warned there could be a risk of Britain leaving the EU without a deal "by accident" if negotiators wait too long.
Jeremy Hunt's also called for "more flexibility and creativity" to secure a deal.
