Lord Daniel Moylan believes Michelle O’Neill is in “danger of becoming a Nicola Sturgeon sort of joke figure”.
Sinn Fein, who became the largest party in the Northern Ireland Assembly during last week's elections, are supportive of the reunification of Ireland.
The party’s vice-president, Ms O’Neill, is now Northern Ireland’s putative First Minister.
Lord Moylan speaking to Dan Wootton
GB News
Michelle O'Neill
Liam McBurney
But Lord Moylan believes there is “not the slightest prospect” of the island of Ireland achieving unification in the “foreseeable future”, adding that Ms O'Neill could become a "joke figure" like Scotland's First Minister.
Speaking on GB News’ Dan Wootton Tonight, Lord Moylan said: “This is a significant moment that Sinn Fein is entitled to claim the ministership under the current rules of the GFA.
“But it’s not because they have got bigger, it’s because the unionists voters split so there are more unionist parties now in the assembly.
“The union itself is absolutely safe.
“Michelle O'Neill in danger of becoming a Nicola Sturgeon sort of joke figure, constantly promising a referendum, an Irish unification, its all going to happen in the future.
“But there isn’t the slightest prospect in either country in the foreseeable future that there will be independence in the case of Scotland or for unification in the case of Northern Ireland, so the whole thing is completely bogus.
“The union is completely safe and we can put that whole thought behind us now.”