The Government estimates that there are around 10,000 Irish undocumented migrants living in the United States.
Immigrant support groups in the US have reported a big increase in deportations over the last year since Donald Trump took office.
For many of the undocumented, day-to-day life involves constantly looking over your shoulder hoping to avoid arrest.
Washington Correspondent Brian O'Donovan travelled to Boston and metmembers of Ireland's undocumented migrant community.
At the Irish Pastoral Centre in Dorchester, Boston, we met Stephen and Alan. Those are not their real names. They don't want their identities to be revealed for fear of deportation.
Both men are builders and we met them at lunchtime on a weekday. They were in their work clothes and were doing a construction job in the area. They work hard, they pay their taxes, they both have families and they drop their children to school every day but Stephen and Alan live in constant fear of being arrested by the immigration authorities.
Stephen has been living in Boston for 11 years. He tells me: "You're driving around, dreading being pulled over by a police officer but I have to take the risk to provide for my family."
Alan, who has been in the US for six years, has had a similar experience and says: "You go to work, you wear your seat belt, you don't talk on the phone while driving. You're constantly thinking what if there's a police car behind you? What if he pulls you over or what if someone crashes into you?"
Stephen and Alan say there is a sense of fear among the Irish undocumented community particularly when there is a visit to the neighbourhood from the Immigration and Customs Enforcement Agency, better known as ICE.