It is impossible for European Union nations to accept any more refugees, the French prime minister has been quoted as saying, and the fate of the bloc depends on its border controls.

Manuel Valls reportedly made the comments in the German newspaper Sueddeutsche Zeitung.

Reuters reported that roughly 1 million refugees were expected to arrive in Europe this year. Germany, which began accepting refugees in September, was originally praised for opening its doors for those fleeing the war-torn Middle East. But the nation’s chancellor, Angela Merkel, has faced more and more scrutiny as the number of migrants going to Europe has continued to rise.

Valls, in his comments to the German newspaper, warned that Europe’s external borders needed more stringent regulations.

“If we don’t do that, the people will say: Enough of Europe,” Valls was quoted as saying.

The BBC reported that select European nations have enacted stricter border controls in the wake of the Nov. 13 Paris terrorist attacks that left 130 dead. The attacks have added fuel to the debate over the migrants, particularly because a forged Syrian passport was found near one attacker.

Critics fear terrorist groups could take advantage of the ongoing migrant crisis, which Reuters called the continent’s worst since World War II, and use it to funnel terrorists into Europe.

Economic officials from both France and Germany have proposed setting aside $10.7 billion to improve security, border controls and refugee care, Reuters reported.

The European Union has also voted to devote $3.1 billion for an aid facility in Turkey, which it hopes will help lower the number of migrants headed to Europe, Reuters reported. However, it’s still not finalized and it’s unclear if the member nations will give enough money to fully fund it.

A summit between Turkey and the European Union is scheduled for Sunday. Officials told Reuters there are still major hurdles to clear before any migration pact will be finalized.