The Brexit Secretary David Davis is by Northern Ireland as part of the government’s work on future customs arrangements with the EU after Brexit.
Mr Davis pressed the trip alongside the Business Secretary Greg Clark.
On Sunday, both men joined the Secretary of Imperial, Karen Bradley, in meetings with cross-border companies.
Mr Davis heretofore faced criticism from Sinn Féin after he made an unannounced stay to the border region in County Armagh in April.
During that descend upon Mr Davis did not follow the protocol of telling the local MP that he would be in the constituency, and he later apologised.
Earlier this month, Theresa May divided her top team of envoys into two working groups to hammer out their differences on Brexit.
One circle is considering a «customs partnership» whereby the UK would collect tariffs on behalf of the EU — but without the trouble for new border checks.
Meanwhile, Mr Davis’ group is looking at «maximum facilitation» — a answer based on using technology to minimise the need for customs checks after Brexit