But Loyalists in Northern Ireland reacted with concern to the developments.
“It could be one or two things,” Mr Wilson said. “Northern Ireland could be used as the excuse for undoing Brexit.
“Or Northern Ireland could find itself further sacrificed, where the UK government then agrees with Europe, ‘Well, look, we’re not going to complain too much about what you do in Northern Ireland, your imposition of regulations in Northern Ireland, your disruption of trade in Northern Ireland, if you’re prepared to do deals with us on the things that matter to Great Britain’.
“We warned the people of the United Kingdom that there was always a danger – despite what they said – with the Labour Party because they were never committed to Brexit.
“In fact, they were opposed to it. Keir Starmer, don’t forget, wanted a second referendum to try and undo it.
“So the Labour Party has got form on this and it will be important to watch every move that they make very carefully.”
The Prime Minister has previously said that the government’s desire to reset relations with the European Union does not mean reversing Brexit.
Sir Keir’s visit made him the first prime minister to visit the republic in five years.
‘Real intention’ to reset relationships
Jamie Bryson, the prominent Loyalist activist, said the talks represented a continuation of “appeasement” towards republicans in Northern Ireland.
“The British government is storing up another round of political instability in Northern Ireland by continuing the policy of Irish nationalist prioritisation and appeasement,” he said.
“Political unionists are once again going to feel pressure from the grassroots who continue to legitimately question what the point of the power-sharing arrangements is in Northern Ireland when it operates on the ethos that unionism must give, and nationalism must get.”
Mr Harris was the first international leader hosted by the Labour leader in Britain following the July election.
Sir Keir said meeting Mr Harris twice within his first nine weeks in office as Prime Minister shows a “real intention” to reset relationships to the “great benefit” of both the UK and Ireland.
But the Prime Minister would not be drawn into saying if Brexit had been an obstacle to resetting the UK and Ireland’s trade relationship.