(13)In exceptional circumstances that warrant the exclusion of certain exposures to central banks from the leverage ratio and in order to facilitate the implementation of monetary policies, competent authorities should be able to exclude such exposures from the total exposure measure on a temporary basis. For that purpose, they should publicly declare, after consultation with the relevant central bank, that such exceptional circumstances exist. The leverage ratio requirement should be recalibrated commensurately to offset the impact of the exclusion. Such recalibration should ensure the exclusion of risks to financial stability affecting the relevant banking sectors, and that the resilience provided by the leverage ratio is maintained.