His warning comes a day before the EU is expected to formulate a plan to address issues with the protocol, which have caused economic barriers between Northern Ireland and Britain.
To ease the so-called Sausage Wars, Brussels has proposed that cold meat could continue to cross the Irish Sea from Britain after the end of the current grace period.
But Lord Frost would use the speech Lisbon To warn that the agreement must go far beyond this to address issues such as the role of the European Court of Justice in Northern Ireland.
The Commission has been very quick to dismiss governance as a party issue. the reality is the opposite
“The EU now needs to show ambition and willingness to tackle the fundamental issues at the heart of the protocol,” he is expected to tell the diplomatic community.
“The Commission is very quick to dismiss governance as a party issue. The reality is quite the opposite.
“The role of the European Court of Justice in Northern Ireland and the resulting inability of the UK Government to properly implement the very sensitive arrangements in the Protocol have created a profound imbalance in the way the Protocol operates.
“Without the new arrangements in the region, the protocol will never get the support it needs to survive.”
Ireland’s Foreign Minister Simon Coveney questioned whether Britain’s ministers “really want to move forward in an agreed way or further sever ties?”
“The EU is working seriously to address practical issues with the implementation of the Protocol – so the UKG (the government) creates a new ‘red line’ barrier to progress, that they know the EU will not move forward Could… are we surprised?” He tweeted.
A government source threatened that the UK would effectively override Article 16 of the protocol if the EU proposal was to “tamper around the edges”.
The protocol was negotiated to avoid a hard border with Ireland by effectively placing Northern Ireland in the EU’s single market for goods.
But federalists are pushing for it to be abolished because it has created trade barriers on products crossing the Irish Sea from Great Britain.
Lord Frost will also share a new legal text with the European Commission this week to propose a “foundation” for a new protocol to support the Good Friday Agreement.