The Foreign Secretary's comments show Theresa May's cabinet is still divided
The leader of Northern Ireland's Democratic Unionist Party insists it is possible to leave the customs union and still avoid a hard border with the Republic of Ireland
Why is the UK embroiled in a row over the EU's Customs Union? Theresa May's government is committed to leaving it but her cabinet can't agree on an alternative.
Senior British lawmakers that back Brexit have demanded that she drops a proposal for a customs partnership with the EU once it leaves the bloc
UK: Parliament approves motion urging the government to pursue customs union in Brexit negotiations
The UK negotiating position on trade after Brexit remains uncertain. The Trade Secretary wants to leave the customs union, but momentum is building for staying inside.