King Charles has been criticised for his involvement in the finalising of the so-called Windsor Framework Brexit agreement aimed at restoring power sharing in Stromont.
DUP politician Sammy Wilson warned the monarch he will “regret” his decision to meet EU Commission President Ursula von der Leyen in the future.
Speaking to The Telegraph’s Chopper’s Politics podcast, Mr Wilson said: “It’s a decision that the King will come to regret in the future.”
He added: “I don’t know whether it was his choice, or whether the Government persuaded him to do it, but I think it’s a very, very dangerous position for him to have taken.
“There’s no part of the United Kingdom that gives adherence to the Monarchy and respects the Monarchy as much as unionists in Northern Ireland all throughout the Troubles.
“As governments have come and gone, and governments have betrayed us, the one stable thing that stayed in that was the Monarchy.
“It’s a very, very dangerous thing that has been done. And don’t forget, this is just not the Monarchy taking sides in a dispute between the DUP and the Government.”
Mr Wilson added “the King has to explain” why he met with the Commission chief, adding: “But the one thing I do know is that it is a bad decision.
“And if he keeps going down this route and politicising the Monarchy, then the status that his mother had, he will never acquire.
“And he will put the Monarchy in jeopardy because people will simply see it as partisan rather than a national institution.”