Spain has joined Poland in becoming the second country this week to claim it could ditch the EU, amid growing fury at the power that Brussels holds over member-states. Spain’s third biggest party Vox is under huge pressure to back the Spanish version of the Brexit referendum, following growing fury at an ECJ ruling this week. Vox’s own party president lambasted the EU, claiming when the ECJ overruled Spanish courts, it had humiliated the country and its sovereignty.

On Thursday, the EU’s top court ruled a jailed Catalan separatist leader should have parliamentary immunity.

Oriol Junqueras was one of nine pro-independence leaders jailed in Spain after an illegal independence referendum.

However, in May he was elected to the European Parliament as an MEP.