74In the light of the foregoing considerations, the answer to the second question is that Article 20 TFEU must be interpreted as meaning that the competent national authorities and, as the case may be, the national courts of the host Member State are required to ascertain whether the decision to revoke the assurance as to the grant of the nationality of that Member State, which makes the loss of the status of citizen of the Union permanent for the person concerned, is compatible with the principle of proportionality in the light of the consequences it entails for that person’s situation. That requirement of compatibility with the principle of proportionality is not satisfied where such a decision is based on administrative traffic offences which, under the applicable provisions of national law, give rise to a mere pecuniary penalty.