The row over border checks is, however, about more than a quick flash of a passport. The response to the migrant crisis has been for governments to reassert their position at a nation-state level, thereby enfeebling the EU rather than strengthening it. It provides a marked contrast with the Eurozone crisis, which highlighted significant weaknesses with the EUs system of economic and monetary union. Back then, the states pulled together to deal with the problem (largely at Greeces expense, of course), introducing the European Stability Mechanism and instigating a banking union. What didnt kill the EU, made it stronger.

In comparison, governments have been willing to jettison Schengen and with it the fundamental EU principle of free movement, for national reasons. It turns out sovereignty matters in countries other than the UK, after all. The migrant crisis could have provided the impetus for member states to seek out ever closer ties, but instead they have ridden roughshod over what was meant to be a core value of EU integration. Little wonder that federalists are so concerned: in 2018, the President of the European Parliament wrote that the situation threatens to destroy the EU.

2020 was supposed to be the year when the Schengen crisis came to an end, with the EU hoping that the border checks would at last be removed. But now we have coronavirus. For France, Germany and the others, this would seem like a dangerous time to belatedly allow people to move without checks. In numerous other states that have continued to adhere to the Schengen rules even in the midst of the migrant crisis, border controls may be introduced for the first time in decades.

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The coronavirus outbreak shows the real limits of a borderless EU - Telegraph.co.uk