He said Britain must end "ambiguity".
Discussions open as UK and German business leaders jointly call far "business critical" issues such as workers' rights, tax and customs arrangements to be tackled.
Labour is putting forward an idea that it knows to be unworkable.
The freedom of movement has come under strain in recent years.
Slovenian PM's warning would be a big blow for Theresa May and David Davis.
Plan means Britain would not have to submit to the European Court of Justice.
British government may have to relax its immigration rules to secure new trade deals.
The economics behind the popular sandwich is more complicated than you think.
Paper suggests soft transition to avoid a 'cliff edge' for British exporters.
Labour MP Chuka Umunna blames Eurosceptic cabinet ministers as Tories put on show of unity.
Leo Varadkar added that "time is running out" to find a workable border arrangement in Northern Ireland.
A string of attacks across the bloc has seen the issue surge, according to the Eurobarometer.
Italy plans to send warships to Libyan waters and has drawn up rules that must be followed by NGOs that rescue migrants.
"What would they do with the British Open if they ever got out?" the golf-course owner said.
YouGov survey shows 'Brexit extremism' is rife among Leave and Remain voters.
Conservative grandee weighs in on the side of the Chancellor in Cabinet Brexit row.
UK voters should not expect an immediate halt on EU nationals coming to Britain.
Banking and medical agencies will quit the UK once it leaves the European bloc.
Americans are as fussy about hygiene as any people on Earth.
"That is neither our plan nor our vision for the future," the senior Conservative said.
EU parliament's chief Brexit negotiator met up with Davis at the UK's famous Silverstone circuit.
SNP-led Scottish government warns about cheaper imports from the US.