Jeffrey Donaldson, a member of Parliament and leader of Northern Ireland's Democratic Unionist Party, said the protocol itself is undermining the peace process because it threatens the key principles of the Good Friday Accords, also known as the Belfast Agreement.

"If Nancy Pelosi wants to see the agreement protected, then she needs to recognize that it is the protocol that is harming and undermining the agreement," Donaldson said. "And that is why we need to deal with it."