The Dail and the House of Commons both meet in emergency session today to pass similar Bills giving legal effect to new measures to curb paramilitary acts following the Omagh bombing.
On the eve of the recall of both parliaments from their summer recess, Government sources signalled that further amendments to the Offences Against the State (Amendment) Bill, tabled by Opposition parties, will have been considered overnight.
Two significant amendments are among a series of drafting changes already proposed by the Minister for Justice, Mr O'Donoghue, yesterday.
An accused person will have to be produced before a judge in court if an application is made to extend the period of detention from 48 hours to 72 proposed in the new Bill.
The judge will hear any submissions made and consider any evidence adduced by or on behalf of the detained person and the garda making the application.
The Government has also accepted that inference may not be drawn from the silence of the accused after the person has been charged with membership of an illegal organisation.
Government sources said last night that these amendments were accepted to allay possible constitutional concerns about the new legislation.
The British government's draft Criminal Justice (Terrorism and Conspiracy) Bill received the full support of the Conservatives and Liberal Democrats last night.
However, several Labour backbenchers and civil liberties groups remained unconvinced that the measures were justifiable.
The Dail is due to sit for 13 1/2 hours today to hear statements on the Omagh tragedy, followed by a minute's silence, before proceeding to debate all stages of the Bill.
The Seanad will be recalled tomorrow with the aim of having the Bill signed into law by the Presidential Commission, in the absence of President McAleese, by the end of the week.
The House of Lords will consider the British legislation on Thursday.