A judge will rule tomorrow if he will hear a bail application for a man described by the FBI as being the largest facilitator of child porn on the planet.
Eric Eoin Marques is wanted in the United Stated on four charges linked to website images described as being extremely violent, graphic and depicting the rape and torture of pre-pubescent children.
The 28-year-old, who has Irish and US citizenship, is back in custody after appearing before the High Court in Dublin where extradition proceedings are under way.
He was previously refused bail for fear he was a flight risk or would destroy evidence.
After lengthy arguments from legal teams for and against a new application, Mr Justice John Edwards said he will make his decision in the morning. If he agrees, the full hearing will begin at 3pm tomorrow.
Marques is wanted in connection with four counts involving the advertising of child pornography, distribution of child pornography, conspiracy to advertise child pornography, and conspiracy to distribute child pornography.
Defence barrister Remy Farrell argued his client was arrested by police in the Irish capital on August 1 and was refused bail while being held on a provisional arrest warrant and may have been freed within 18 days if a full warrant had not been issued.
He said his client will fight his extradition.
Patrick McGrath, for the Attorney General of Ireland, argued there were no new grounds for another bail hearing and that the proper channel was to appeal the first judge's decision to the Supreme Court.
An FBI special agent previously told the court Mr Marques, who has an address on Mountjoy Square in Dublin's north inner city, is suspected of being "the largest facilitator of child porn on the planet".
The charges date from July 24 2008 to July 29 2013 and each carries a maximum penalty of between 20 and 30 years.
If convicted in the US on all four counts he faces up to 100 years in jail.
He is accused of being the sole administrator of a hosting server where multiple websites were held and where it is alleged pornographic images were shared
Mr Marques has denied being the administer of the anonymous hosting server.