Government ministers have also been seen entering Augustine House as preparations continue for the highly anticipated announcement.
The press conference is expected to outline significant legislative proposals which the Irish government intends to bring before the Oireachtas on Saturday evening.
The precise nature of the proposed legislation has not yet been disclosed, leaving questions about which areas of government policy could be affected.
Ministers gather ahead of announcement
Images published by RTÉ News show government officials arriving at Augustine House, with a black official vehicle pictured outside the building.
In a social media update at 16:42, RTÉ News reported that government ministers had been seen entering the premises ahead of the scheduled press conference.
Illustrative image. RTÉ News published an image of an official vehicle outside Augustine House as ministers arrived.
Minutes later, at 16:48, the broadcaster reported that the Taoiseach had also arrived, publishing an image showing a green helicopter outside the government building.
The arrival of senior government figures comes as attention turns to the legislative programme expected to be unveiled later this evening.
Major legislation expected to be unveiled
According to the official event announcement, the Taoiseach will use the press conference to announce major government legislation scheduled to be heard by the Oireachtas on Saturday night.
However, the government has not yet publicly confirmed the contents of the proposed measures, their intended objectives or whether they will require urgent parliamentary consideration.
It is also not yet clear whether the announcement will involve a single major legislative proposal or a wider package of government reforms.
Further details are expected to emerge once the Taoiseach addresses the press.
Political attention turns to Augustine House
The announcement is likely to attract attention from members of the Oireachtas, opposition parties and the wider public as the government prepares to set out its legislative priorities.
Any proposed legislation would be subject to the relevant parliamentary procedures, with members of the Oireachtas potentially given the opportunity to debate, scrutinise and propose amendments to the measures.
The scale and political significance of the announcement will become clearer once the government formally outlines its plans.
Press conference due to begin shortly
The government press conference is scheduled to take place at Augustine House in County Monaghan this evening.
Members of the public can follow the event through the official Discord event page.
BBC News will continue to follow developments from Augustine House and provide updates as the Taoiseach’s announcement gets under way.