The statement from the government suggests a possible rift between London and Dublin over what to do if the negotiations between the parties in Northern Ireland - principally the Democratic Unionists and Sinn Féin - fail to produce a compromise.
The UK government has argued that there might be no customs implications at all for road and rail crossings if ambitious post-Brexit deal is struck.
Its Brexit Task Force has issued a Guiding Principles paper on Ireland in the context of Brexit negotiations today.
New royal baby to shake up House of Windsor pecking order
George will be dressed in his new uniform, a navy v-neck pullover, matching Bermuda-style shorts, long red socks and black shoes. The Duchess suspended all Royal engagements as a result of the illness, for which she has previously been hospitalised.
In its new position, Brussels clearly stipulates that the solution for the Irish border problem is clearly the responsiblity of Britain.
He said: "I like what the British government is saying about the need to maintain a soft border but it's very unclear how that would be done if we leave the customs union".
Trade between the United Kingdom and Ireland was worth €19.9 billion euros in 2015, according to the British Irish Chamber of Commerce's website.
He accused Britain of wanting the EU to "suspend the application of its laws" as a test case for broader EU-British customs regulations.
"We can not and will not support that and nor will the European Union", he said, adding that Britons wanted to avoid a hard border too.
Stoke ends United's ideal start to EPL season
Stoke: Butland 7, Cameron 6, Zouma 8, Wimmer 6, Diouf 6, Fletcher 6, Allen 6, Pieters 6, Shaqiri 7, Jese 6, Choupo-Moting 8. When questioned about it later, Hughes simply laughed it off but Mourinho snapped at the reporter who asked the question.
Ireland has welcomed Britain's commitment to upholding the Northern Ireland peace process and retaining freedom of movement across the border, but has warned it would not be "used as a pawn" in the larger talks.
As for the common travel area agreement, which predates both countries' EU membership, the European commission hints again that Ireland must be able to "honour its obligations as a European Union member state".
On Twitter on Monday, however, the European Union negotiator claimed he had told delegates that Brexit was an "occasion to explain single market benefits in all countries, including my own", adding: "We do not want to "educate" or "teach lessons".
Brussels has insisted the UK makes "sufficient progress" on its financial settlement - as well as the Irish border issue and rights of EU citizens in Britain - before talks can move on to discussions over the future EU-UK trade relationship.
It called on the United Kingdom to make "substantive commitments and workable solutions".
Polk deputies warn criminals, sex offenders not welcome at hurricane shelters
Complaints about the bold vow seem to be coming mostly outside Polk County, given Judd is an incredibly popular sheriff. Horstman defended the policy. "The jail is a safe and secure facility you can seek shelter from the storm there".
Barnier repeated his point that the interests of Ireland and the remaining European Union 27 are the same.
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