The leaders of the lower chambers of parliament of Germany, Italy, France, and Luxembourg have called for a European “Federal Union” in an open letter published in Italian newspaper La Stampa on Sunday.

In the letter, four representatives of EU governments – Claude Bartolone of the French National Assembly, Laura Boldrini of the Italian Chamber of Deputies, Norbert Lammert of the German Bundestag, and Mars Di Bartolomeo of the Luxembourg Chamber of Deputies – say that closer cooperation is essential for dealing with problems that no one EU state can tackle on its own, such as immigration, terrorism, and climate change.

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“Now is the moment to move towards closer political integration — the Federal Union of States with broad powers. We know that the prospect stirs up strong resistance, but the inaction of some cannot be the paralysis of all. Those who believe in European ideals, should be able to give them a new life instead of helplessly observing its slow sunset,” the letter read.

The letter’s authors also warn that the European integration project is currently more at risk than ever before, with high unemployment and immigration problems driving populist and nationalist movements. The EU must also come to grips with the fact that, last June, the United Kingdom decided to leave the union after holding a national referendum, aka Brexit, becoming the first member nation to opt out of the bloc.

On Sunday, a number of EU states, including Germany, France and Italy, called for the UK to pay a hefty price as a “divorce settlement.”

The letter was published in the run-up to a meeting of parliamentary leaders in Rome on March 17 to mark the 60th anniversary of the Treaty of Rome, which established the European Economic Community (EEC). The treaty’s signing by six countries– Belgium, France, Italy, Luxembourg, West Germany and the Netherlands – in 1957 eventually paved the way for the Maastricht Treaty and the European Union in 1991.

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In September of 2015, Lammert, Bartolone, Boldrini and di Bartolomeo also signed a declaration calling for deeper and faster European integration.

However, greater European integration is being increasingly challenged by a number of Eurosceptic parties around the continent, including the Alternative for Germany, the National Front in France, and the Party for Freedom in the Netherlands. Upcoming elections could bring these parties closer to power.

According to the European Parliament’s chief Brexit negotiator, Guy Verhofstadt, the European Union must reform, or it risks disappearing under a barrage of internal and external attacks.

Late last year in an interview with RT, prominent American linguist, scholar, and activist Noam Chomsky also warned that the surge in right-wing and anti-establishment sentiment stemming from Europe’s failed neo-liberal policies is likely to lead to the EU’s collapse, adding that “it would be a tragic development” if the bloc fell apart.