Taoiseach Leo Varadkar will meet the British Prime Minister in New York later to discuss Brexit.
It's the second time in a matter of weeks the two leaders have met as the Brexit deadline looms.
Leo Varadkar and European Council President Donald Tusk yesterday said no workable proposals to replace the backstop have come from the UK.
— Charles Michel (@eucopresident) September 23, 2019
Speaking ahead of today's meeting, the Taoiseach said: "Our bottom line is that we need a legally binding assurance that there won't be a hard border between North and South; that the all-island economy will continue to operate; that North-South cooperation will be able to continue.
"We can't accept some sort of halfway house."
Meanwhile, the Supreme Court in Britain will make its ruling later on whether Boris Johnson was acting lawfully when he suspended Parliament.
Evidence was heard over three days last week, and judges will announce their decision at 10:30am.