Britain is weeks away from making a decision on its future customs agreements with the European Union, said a minister, adding new food to a debate that slows Brexit talks in Brussels and domestic politics.
How to make Britain's new EU border "as smooth as possible" when it leaves the block becomes a headache.
May, subject to support for a small Northern Irish majority party in parliament, is under pressure from Brexit activists They are dropping their preference for a customs partnership to keep free trade free.
On Sunday, her Economics Secretary Greg Clark pleaded again for this partnership, saying the ministers worked on it and another high-tech company
Both options were rejected by EU negotiators.
"I have never been so clear in this life in my life, so I feel very strong, it is absolutely right that we should leave the Customs Union … but what we replace with it is of great importance, "he told the BBC, denying that he had left a crunching session on customs last week.
Clark using the example of the automaker Toyota who relies On components that cross borders to produce cars in the UK, companies needed to know what would happen next, but warned that it was not just one Decision, but also the implementation after the agreement could take.
"As part of working in the coming weeks, it would be a mistake to move from one situation to the next and to a third," he said, arguing that ministers could improve both options while admitting both Have disadvantages.
"Whatever option is chosen, it will take some time to set it up and make it available."
His message was supported by company and former Minister Amber Rudd, whose resignation from the government could encourage these Conservative MPs to maintain for Britain to argue in close trade relations with the EU.
In a tweet to Clark, Rudd said, "Right, clear and passionate the case for a Brexit that protects existing jobs and future investment."
Britain's future tariff regulations, after having left the blockade in March next year, are fast becoming the main focus of the Brexit debate, as some fear there might be a return to a hard line between Britain's Northern Ireland and the United Kingdom Reviving sectarian violence
The Labor Party's main opposition party says it can overcome this problem by supporting a new customs union, said John McDonnell, the head of fiscal policy, as close as possible to the EU single market.
May has vowed to abandon the Customs Union, which sets tariffs on goods imported into the bloc so that Britain can negotiate its own free trade agreements, and tried to appease Brexit activists by repeating their pledge, in the Sunday paper "The Take control of our borders, our laws and our money "in the sun.
But May's fragile position in parliament was unmasked by an offer from some MPs to oblige the government to sign a customs union by filing amendments to two bills that could defeat the government.