It delivers “long-lasting solutions” that will work for the people and businesses of Northern Ireland, she added.
It also allows the UK government to determine sales tax rates for businesses in Northern Ireland and gives the Northern Ireland government emergency powers to oppose new EU rules on some goods.
A boost to BritainBeyond its importance to Northern Ireland, the deal eases the uncertainty Brexit created for Britain.
The new Northern Ireland deal opens the door to closer UK-EU cooperation on financial services, energy, immigration and scientific research, according to experts.
“You need to address the Protocol before you do anything else,” said Anna Jerzewska, the founder of international trade consultancy Trade & Borders.