Theresa May is cutting short her holiday to meet Emmanuel Macron for talks as she intensifies efforts to win support for her Brexit plans.
After the hastily-arranged talks, May and her husband Philip will join the president and his wife Brigitte for a private dinner at his summer retreat, Fort de Bregancon, on a small island off the French Mediterranean coast.
The Prime Minister is ending her break in the Italian Lakes a day early in the hope of winning over Macron.
It comes after Brexit Secretary Dominic Raab held talks with his counterparts in Paris on Thursday.
The EU's chief Brexit negotiator, Michel Barnier, warned some of Mrs May's Brexit plans would "undermine" the single market in an article published in 20 newspapers across Europe.
He said: "The UK knows well the benefits of the single market. It has contributed to shaping our rules over the last 45 years.
"And yet, some UK proposals would undermine our single market which is one of the EU's biggest achievements.
"The UK wants to keep free movement of goods between us, but not of people and services.
"And it proposes to apply EU customs rules without being part of the EU's legal order.
"Thus, the UK wants to take back sovereignty and control of its own laws, which we respect, but it cannot ask the EU to lose control of its borders and laws."