Taoiseach Bertie Ahern has said he is disappointed by the decision not to charge any security force members over the murder of solicitor, Pat Finucane.
Pat Finucane was shot dead by loyalist paramilitaries
Mr Finucane, 39, was shot dead at his north Belfast home by the UDA in 1989.
On Monday, The PPS said insufficient evidence was "critical" in its decision.
Mr Ahern told the Dail the PPS decision further strengthened the case for an independent public inquiry into the killing.
"We remain in touch with the Finucane family and continue to offer our full support in every way," he added.
"This is clearly a further disappointing development, not least for the Finucane family, and it does not alter the need in our view, and our stated position will remain, for an independent inquiry to allay any of the concerns surrounding this case."
The killing was one of the most controversial of the 30 years of the Troubles in NI because of allegations of security force collusion.