Minister for Foreign Affairs Dermot Ahern is to travel to Boston, New York and Washington next month as part of a lobbying campaign for the introduction of laws regularising the situation of an estimated 25,000 undocumented Irish nationals working illegally there.
Mr Ahern is expected to meet Irish community groups and Irish-American politicians to discuss the issue at the beginning of next month.
His officials are also finalising details of a planned trip to Washington at the end of November, during which he is expected to meet US congress members currently debating legislation on the issue.
Mr Ahern is expected to stress the cross-party support in Ireland for a Bill sponsored by senators Edward Kennedy and John McCain, which would create a temporary worker status for illegal immigrants, providing them with a basic legal status.
The Kennedy McCain Bill is facing some opposition within the House of Representatives, and there are concerns that many of the provisions could be diluted.
All parties in the Dáil came together last Thursday to issue a motion in support of the Bill.
Almost every party in the Dáil has in recent years supported efforts to ease the situation of illegal Irish immigrants in the US, many of whom arrived in the US in the 1980s on holiday visas and remained there.
A number of politicians, including representatives from Fine Gael, Fianna Fáil and Sinn Féin, have travelled to the US to discuss the issue.
Since the September 11th, 2001, attacks, there has been a clampdown on illegal immigrants in the US.
Undocumented Irish living in the US have been unable to visit Ireland because they risk not being able to return to their US homes and businesses.
They have also had serious difficulties accessing medical and other services.