Cavan and Monaghan are particularly exposed because of the 'unconstitutional control' of Ireland's skies by a foreign power.
This is according to Senator Gerard Craughwell who is taking a case against the State because of a decision to give the RAF the power to protect Irish skies in the aftermath of 9/11.
Speaking to Northern Sound, he highlighted how it was an unconstitutional move because the decision never came before the Oireachtas.
Senator Craughwell pointed to the removal of the barracks in Cavan and Monaghan and how this left them "particularly exposed" because of their proximity to the border.
He added that it will take a referendum to allow a 'foreign power' to protect Irish skies in order to legitimise the situation.
"After the 9/11 attack in New York, the Irish airspace was vulnerable," the Senator continued.
"We did not have the capacity to get jets into the sky if there was a highjacked plane, for example, coming into Ireland.
"Somewhere somebody agreed a deal with the RAF to provide cover for our airspace."