Fianna Fáil leader Micheál Martin has called on the Taoiseach to roll the current investigation into the CervicalCheck controversy into a Commission of Investigation.

His call follows criticism by Dr Gabriel Scally, who is carrying out the investigation, that documents given to him were not supplied in a searchable manner.

"We are now looking at a potential Commission of Investigation starting in November if we are lucky," Mr Martin said, adding that it would give Dr Scally teeth if his inquiry was on a statutory footing.

During Leader's Questions, the Taoiseach said he wanted to make it very clear that they expected full cooperation with Dr Scally and his team.

He pointed out that Dr Scally was broadly content, despite the fact that the documents were sent to him in unsearchable format.

Mr Martin said consideration would have to be given to the idea of rolling Dr Scally's report into a Commission of Investigation.

The Taoiseach said while it is intended to hold a Commission of Investigation, this would be much slower, as it takes months to set up and can be a year or two before its findings are published.

He said the point of having the inquiry carried out by Dr Scally was to have answers quickly. 

"We have found on a number of occasions with Commissions of Inquiry that it takes months to set it up, a year or two years before they complete their work and have their findings and recommendations," he said.

He added that he was absolutely committed to holding a statutory inquiry.

Varadkar says Govt will 'hold firm' in EU summit

The Taoiseach has said the Irish Government will "hold firm" in the June EU summit to commitments it has made regarding Brexit and he expects the UK Government and others to "hold firm".

Mr Varadkar was responding to the Sinn Féin TD, who said the Government's "cast iron guarantee is in tatters".

"We have an extraordinary situation that was real and tangible regarding political agreement and it has been changed into something different due to internal wrangling in the Tory party", said Mr Cullinhane.

He said the recent paper published by the British government took the backstop off the table and turned it into a UK-wide extension of the implementation of the period which is time framed.

Mr Cullinhane asked how the Taoiseach could call it cast iron and how he could expect real and substantial progress by June.

The Taoiseach said no one would doubt the cast iron guarantees given in December on the common travel area, the peace fund and citizens rights.

However, Mr Varadkar said he also noted that he used the term bullet proof in December regarding commitments on the border and that he said it was the end of the beginning, not the beginning of the end.

He described the UK government's paper as a small step in the right direction but he said it was not adequate.

"At very best it's a partial solution to part of the problem", he said, "it deals with customs which is welcome, but doesn't deal with regulatory alignment which is essential to avoiding a hard border".

Mr Varadkar noted that the paper implied an expiry date sometime in 2021, which he said is something the Government cannot accept.

"The whole point of a back stop is that it implies unless and until there's a new treaty between the EU and UK that makes it unnecessary", he said.

"That's where we need further movement and further concessions between now and the UK summit in June".

The Taoiseach said if that is not achieved, nobody could say sufficient progress has been achieved and the negotiations will need to be intensified in the months ahead to ensure that happens.