The Finance Minister Michael Noonan the Government had to add more members to the banking inquiry to reverse a 'stroke' pulled by Fianna Fáil in the Seanad.
He made his remarks as one of the senators at the centre of the row Michael D'Arcy has indicated he has no intention of standing down.
There has been calls for Senator D'Arcy and his colleague Susan O'Keefe to resign from the committee after being appointed to ensure a government majority.
"The only reason this committee ended up not reflecting what was normal practice since the State was founded was that some Labour senators didn't turn up for the vote and Fianna Fáil took advantage of that by putting one of their senators in, contrary to the agreement," Noonan said.
"So really what the Taoiseach is doing is normal practice."