German MEP Hans-Olaf Henkel attempted to bend Mr Juncker’s ear and convince him to offer Britain a new EU membership deal that hands more sovereignty to the UK parliament.
In particular, he believes Britain should gain the controls over immigration initially demanded by David Cameron when he tried to renegotiate terms in 2015-16.
He hopes this would change Brits’ minds about leaving the EU and prevent a split in the bloc.
As they met in Strasbourg today, Mr Henkel, who is backed by lobbying group “A New Deal for Britain”, vowed to warn the EU Commission boss that Brexit will have huge economic impacts on the EU.
He planned to remind Mr Juncker: “Britain is the largest single customer of the remaining 27 EU-countries, importing much more from than exporting to the continental EU-countries.”
Mr Henkel said although many EU leaders believe Brexit will cause problems for Britain while leaving their countries unscathed, complex international business relationships will suffer.
He believes tens of thousands of jobs will be at stake if Britain leaves the EU – some in Britain, but many in Europe as well.
Mr Henkel said: “It is so obvious, Brexit will result in a lose-lose situation for both, Britain and the EU.”