Britain's Brexit Minister Lord Frost on Wednesday presented a new round of calls to reshape the deal.
He said the disruption caused by the protocol meant the UK would be within its rights to activate Article 16 of the protocol, which allows parts of the agreement to be canceled unilaterally.
But he said that he would not do so now, and would instead seek to negotiate changes with the EU in talks scheduled for the summer.
In a 28 page document , the UK government has suggested changes to:
- remove customs checks on goods when UK registered companies sending them have declared their final destination to be Northern Ireland
- get rid of certificates and controls for food products "only intended for consumption in Northern Ireland
- Remove drugs entirely from the scope of the protocol
- allow products labeled which comply with UK rules to circulate freely in Northern Ireland with products registered in the EU
Writing on Twitter, Ms von der Leyen said: "L The EU will continue to be creative and flexible within the framework of the protocol. But we will not renegotiate.
"We must jointly ensure stability and predictability in Irlande from the North. "
Downing Street said Mr Johnson used the call to indicate that the UK was seeking " significant changes to existing mechanisms. "
He said the prime minister urged the EU to seriously consider the proposals and hopes they recognize the realities and practical solutions are needed.
The spokesperson said added: "The solutions could not be found through the existing mechanisms of the protocol. This is why we had made proposals for significant changes.
" There is a great opportunity to find reasonable and practical solutions to the difficulties faced by people and businesses in Northern Ireland, and thus put UK-EU relations on a better footing.
"We didn 't expect the EU to take such a purist or maximalist approach ... we didn ' t ask for the removal of theprotocol for the moment. "