Emmanuel Macron recently resigned from the French government to mount a possible presidential bid next year | Thierry Zoccolan/AFP via Getty Images Emmanuel Macron to City: Forget financial passport after Brexit It comes with full access to single market, France’s former economy minister said.

British fund managers should be banned from selling their financial products in the rest of Europe once the U.K. has left the EU, former French Economy Minister Emmanuel Macron said in an interview with the Guardian newspaper.

Macron, who recently resigned from the French government to mount a possible presidential bid next year, argued that the so-called “financial passport” is not "a technical issue but a matter of sovereignty.”

“The financial passport is part of full access to the EU market and a precondition for that is the contribution to the EU budget. That has been the case in Norway and in Switzerland. That is clear,” he said.

British officials such as Foreign Secretary Boris Johnson and Chancellor of the Exchequer Philip Hammond have previously said the City's financial passporting rights would be maintained in the upcoming Brexit negotiations.

Macron’s hard line stance is an indication of the mood in France as the country enters election campaign season ahead of next year's presidential election, set for May.

“We have the eurozone. Could we accept to be cleared, regulated and de facto have inflows and outflows from a country that has decided to leave the EU? For me, definitely not,” the former economy minister told the Guardian in an interview published Saturday.

He also asked the U.K. to formally declare its intention to leave the EU as soon as possible.

“Procrastination is not the right answer. We have to be extremely strict on the implementation of Brexit so there is a common approach between member states. We must avoid a sector by sector or country by country approach, and ask the U.K. to be clear,” he said.

Macron also retrospectively stated his opposition to the deal that former U.K. Prime Minister David Cameron clinched with other EU governments in February in a last-ditch attempt to avoid losing the EU referendum.

“I was completely against the agreements … It just said, ‘OK if you give me more, then I will stay in the club.’ That is the beginning of the dismantlement of Europe. Now just because there is a leave vote, should we rewrite the rules of the club for one country? It’s a very strange defeat for Europe if people accept that.”