The Dáil will debate a motion of no confidence in the health minister this evening.
Sinn Féin have submitted the motion against Simon Harris over his handling of cost overruns at the new National Children's Hospital.
The party has called on called on Fianna Fáil to support the motion.
But Fianna Fáil says voting with the motion would collapse the government at a critical time for Brexit , instead Fianna Fáil TDs will abstain.
When they sit out - the government needs 57 votes to win the motion.
It's the third time since Leo Varadkar became Taoiseach that a motion of no confidence has been put in a Minister - with Eoghan Murphy surviving and Frances Fitzgerald res;igning before it came to the Dáil.