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The news comes as the nationalistic politics of both countries has prompted increased tensions between Brussels.

One EU source told Reuters: "We are confident that the ECJ will confirm validation, then they [Poland and Hungary] must abide by the decision.

"If they don't, then they will face consequences, both financial and political.

“No more opt-outs, there is no more ‘one foot in and one foot out.' We are going to be very tough on this.”