The Government is being asked to intervene at the "highest level" and help bring home two Irish children, whose father was killed in North Carolina over a week ago.
A custody hearing will take place in the US on Friday to decide where Jason Corbett's children should stay.
Their mother died when they were young and they are currently in the care of their step-mother.
Police in North Carolina say they are not looking for anyone outside the home in connection with the death.
Jason Corbett's brother-in-law Dave Lynch is named as the children's guardian in his will.
Fianna Fáil justice spokesman and Limerick TD Niall Collins says the Government must intervene urgently.
He said: "At the highest level the Government has to intervene here because, as we've all being pointing out, the two children are Irish passport holders, they're Irish citizens.
"It's incumbent on the State, on the Irish Government to take every and any means and measures available to it to protect two Irish citizens".
"These children, unfortunately, I think are at risk," he added.
A Facebook page, Bring Jack and Sarah Home, has also been set up for people to share online.