Sinn Fein leader Gerry Adams has been challenged by Taoiseach Enda Kenny to make a statement to the Dail on the disappearance of mother-of-10 Jean McConville.
Meanwhile, US Secretary of State John Kerry has been warned that the stability of the Northern Ireland peace process could be undermined if interview material from the Boston College archive is released.
The remarks come just days after recordings of secret interviews with the late IRA bomber Dolours Price were handed over to the PSNI, who are investigating the disappearance of Ms McConville. Officers travelled to the US to collect the tapes from the Justice Department, after they had been secured by subpoena from Boston College.
Ms Price publicly alleged that Mr Adams was an IRA commander who ordered Ms McConville's kidnapping and killing.
Mr Adams has consistently rejected the accusations.
In the Dail, Mr Kenny told Mr Adams that for "one reason or another" his name was always associated with "elements of that".
"There's a challenge for you now," Mr Kenny said. "Say it on the record."
Meanwhile Senator Robert Menendez, chairperson of the US Senate Foreign Relations Committee, wrote to Mr Kerry warning release of recordings could "still have the effect of threatening the precious peace won by the Good Friday Agreement".
Boston College researchers had fought attempts by the PSNI to secure the recordings and have maintained they do not include Ms Price making allegations that Mr Adams ordered Ms McConville's kidnapping.