Guy Verhofstadt, has predicted a Remain surge as he goes out canvassing with the Liberal Democrats.
He joined Vince Cable in London, saying the party offers an “alternative to nationalism”.
Verhofstadt is the leader of the Alliance of Liberals and Democrats for Europe Party (ALDE), the Europe-wide body of Lib Dem parties, and said he was there not as Brexit negotiator but “as the leader of the liberals and democrats for Europe”.
Asked if his presence could be seen as foreign interference, Mr Verhofstadt said: “This is Europe. Europe, it’s all Europe.
“I think it’s important to show that the European liberals and democrats support Vince Cable,” he said, telling people to support the Lib Dems.
“We want to show by coming here a message to the continent to say ‘never repeat Brexit again’.
“I’m a Lib Dem. It’s natural that people are looking to the Lib Dems when it comes to European elections.
“We want to be the alternative for nationalism and popularism.
“What I think is there will be a huge support for Remain.”
Sir Vince said his party is combatting “ugly populism” and nationalism in the elections.
“We are patriotic people in our different countries, but we are fighting nationalism,” he said.