The Taoiseach's handling of the Leo Varadkar document leak controversy has damaged Fianna Fáil, according to a backbench TD.
Marc MacSharry, a TD for Sligo/Leitrim has been scathing in his criticism of the approach taken by Micheál Martin.
At a Fianna Fáil parliamentary party meeting on Wednesday, Deputy MacSharry said he was "beyond disgusted" at the Taoiseach's defence of the Tánaiste, who he described as "the sacred cow".
Mr Varadkar has been under continued pressure for sharing the IMO document with a rival union.
He admitted sending a copy of a deal to the then-president of the NAGP, Dr Maitiú Ó Tuathail, but said that the way he communicated the contract "was not best practice".
Deputy MacSharry said today that the situation needs to improve in Fianna Fáil.
He told The Pat Kenny Show: "I felt the party's dealing and handling of the matter did not do anything for the credibility of any of us in Fianna Fáil.
"I believe that the Taoiseach's actions last Saturday and since, without consulting the wider body of the parliamentary party in any way, is what has damaged Fianna Fáil in the last week.
"I told him so, I think he needs to reflect on that now because things need to improve."
Deputy MacSharry said it the "double standards" being presided over by the party this week were "a disgrace".
He said: "We can't have standards being applied in different ways depending on the protagonist involved.
"In that way, I just think there is a major credibility issue around that."
He added: "I think all of us in politics are damaged by this because we're presiding over double standards were its one rule for one and no rules for others.
"This is about right or wrong and applying double standards.
"I don't think it behoves the Tánaiste or any of us in politics to stand by that